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Automatic File Validation Before Uploading Slides

Automatic File Validation in SlideHub Platform

When a presentation is uploaded on SlideHub Platform, before starting the process of adding it to the company library, the system automatically validates it. If any of the following issues arise a warning will appear so the user can resolve it.

File Validation Issue Types

Read the following points to learn how to resolve each type of issue, should it occur

Too large file size
File contains slide with Zoom-in feature
File contains custom font
File contains internal links
File contains multiple language settings
The file contains sensitive content

1. Too large file size

This warning only appears if the file size is over 20MB. If the file size exceeding 250MB, the system will not accept the file for uploading.
Please note if the file size is over 50MB, the file will only be able to upload as standalone slides, instead of being presentation.

Why should you avoid large files in general?

They slow down the performance of your computer as it uses a lot of storage.
The file should be sharable internally/externally eventually, hence if you have a large file, you might not be able to send it via email.
The large file size might experience delayed updating and syncing in the company library, which can cause confusion.

How to reduce the file size?

Check your image save settings. If “Do not compress images in file”, is selected, your file size will increase significantly.
Check if the file has too many customized font types embedded.
If the file contains graphs linked to excel sheets with lots of data, we recommend disconnecting the links or inserting the graphs as images instead.
If the file contains any videos, we recommend replacing the embedded video with “Link to a video file”.

How to link videos?
Click the slide you need to link the video
Click the Video dropdown, and click “Video on my PC”
Once you select the video file, select “Link to file” instead of “Insert”

2. File contains slide with Zoom-in feature

What will happen if a slide with a Zoom-in feature is uploaded?

The slide will generate a preview image, and the slide might look normal. However, the usage of the file is quite limited, because the system will remove the contents of the slide with a zoom link. You will not be able to see the contents or update the contents as long as the slide contains the zoom-in.

What will happen if you select “Exclude slide with Zoom-in feature”?

We provide an option to exclude slides with zoom-ins when you are uploading the file. If you pick this option, the system will automatically delete the particular slide(s) and upload the rest of the slides as standalone slides in the system.

How can you manually remove the zoom-in feature?

If you want to keep the slide with the zoom-in, we recommend replacing the zoom-in's object with regular pictures. It will remove the function of zoom-in, but it will still include the slide contents and the file can be added as a presentation as well.

3. File contains custom font


In the library, we generate the image to show the preview of the file and the PDF version of the file. In most cases, a preview & PDF appears without issue. However, when the file includes custom fonts and SlideHub does not have access to the font, the preview might look different from the actual file.

There are two ways to avoid this issue.

Solution 1: Embed the font directly in the file.
Pros: This will instantly fix the issue. it will allow consistent experience regardless of the person having a font
Cons: It can increase the size of the file substantially and it might give you the file size issue warning when you try to upload the file.

Solution 2: Share the font file to SlideHub, so we can add the font to the system (not embedded in the file). Since this requires our tech team to implement it in your library, we kindly ask you send a ZIP folder with the font to The suggested format for digital display and PowerPoint presentations is .TTF (TrueTypeFont) format.
Pros: You can avoid the large file size
Cons: End-User must install the same font, otherwise the actual file will still look wrong.

How to upload fonts to your library:

This requires our tech team to install the font in your company library. Therefore please send a ZIP folder with the font to The preferred format for digital display and PowerPoint presentations is .TTF (TrueTypeFont) format.

If you keep the links in your uploaded file, the slides or presentation itself will not be able to be updated. To go into further detail, the presentation can be updated, however the presentation cannot sync as doing so would break the links. Thus, the individual slides' content or the sections and order of the slides in the presentation cannot be updated. Should you choose to keep the links SlideHub will not scan the file for multiple languages.

This is why we provide an option to remove all internal links in the file when you are uploading the file. If you pick this option, the system will automatically remove all internal links in order to use the slide as a standalone slide. When a slide is presented as an individual slide, the internal slide links no longer links to slides in the same presentation file. This way, you can decide to keep the file as standalone slides or as a presentation. If the internal link was created in the the files master template placeholder, and you select “Remove links” from validation, the style will revert to the master template placeholder´s default style.

*Please note, if the file size exceed 50MB, the system only accept "Remove links" to proceed the process. SlideHub want to prevent the bad experience caused by carrying internal links in the big size file.

5. File contains multiple language settings

What will happen if the file has multiple language settings?

SlideHub Platform provides a warning mentioning that the file has multiple language settings and also shows exactly which language settings these are.

What options do you have?

You can decide to ignore and leave the file as is. Or you can select one language setting to replace all of the others in the presentation. Doing so does not change the file's appearance in any way. Please note that the language replacement only applies to text elements, other element like images, icons, videos etc. will retain their original language setting.

6. The file contains sensitive content

What will happen if the file contains sensitive content?

The SlideHub redaction tool automatically scans files for sensitive content prior to uploading them to the company library. You can read more about the redaction tool on the below links.

How to use the redaction tool
How to manage your files by using the redaction tool

What options do you have?

You can choose to ignore or to see the sensitive content and then decide what should be done with it.

If you still have questions, don't hesitate to reach out to our team via chat or by email to

Updated on: 05/14/2024

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