How to add custom application icon?

Question

How can I add custom application icon?

When I want to add the icon through the Application settings -> Icon -> New Icon, it returns Internal server error. There's no info about file extensions or anything.

So far I didn't find any info in docs.

Comments

That's a correct way to add the application icon. Something is wrong with the icon storage, perhaps a permission error. Can you check the Tomcat log and paste the exception as a comment to the question?

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1. Is it okay that only root can access /var/lib/tomcat9/work directory?
2. Tomcat logs shows "POST /rest/private/icon-files HTTP/1.1" 200 64"
3. H-MDM logs shows "Unexpected error when handling icon file upload".

Stacktrace: https://pastebin.com/Z3xerUi2

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1. I don't think it is normal. Add read & write access to all users, perhaps this changes things.
2. Looks like the image could not be parsed. Which is the image format you're uploading? Should be PNG or JPEG.

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So... I was uploading .ico file...

PNG works fine! I think that there should be an info about needed file extension ;)