"Uploading" and never uploads. How to fix this?

When users in my discourse site tries to upload something, it says “uploading”, but then it never uploads.

Random users, every few days, complain about this.

What are the troubleshooting steps I can give them?

Last version?

Check the /logs

Could you put your forum’s URL?

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The user tried uploading images 5 times.
(I gave some troubleshooting steps like clearing cache, posting in different thread, posting different image etc. So that way he tried 5 different times, and I can see 5 error messages in logs)

Example error

Is this only happening to users with Windows Phone 8.1 or do you see the error on other platforms as well?

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Phone brand the user is using Redmi (browser : Chrome)