I suggest using a separate service for uploading your images and then link to your upload using the URL field before posting. Catbox works really well. The reason for the error is more than likely because the image is too large for what the instance has set.

This also keeps resources free on the instance you’re using.

Yeah, had previously but its fixed. I think the server is overloaded so you may be facing the issue.

I have to put everything on Imgur and share the image URL. It's been weeks since I could post an image normally.

Yes, couldn't replace a community banner for a couple days because of Jason issues. Someone told me just try again the next day because that had worked for them. Worked for me too.

Currently giving me issues since yesterday but it was working fine.