Since the error is triggered when the file window is opened, I can't even upload a single file. Maybe it's an ubuntu thing. I'll try from another device.
Edit: It seems to be an ubuntu thing. Workaround works with Android/Chrome
On (desktop) Firefox I find that you need to select the image(s) twice before posting and that works fine.
@moocher started
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Since the error is triggered when the file window is opened, I can't even upload a single file. Maybe it's an ubuntu thing. I'll try from another device.
Edit: It seems to be an ubuntu thing. Workaround works with Android/Chrome