Upload to pixelfed then post the link
Gardening
A place for gardening and plant pics
If all else fails, you could upload to Imgur and then post that link. Sorry idk why it’s not working for you.
There's a size limit for pictures, this varies from instance to instance, on mine lemm.ee it's 100kb.
This might be it, I think OP is on lemm.ee as well
I just tried from lemme.world and was having issues, then switched to sh.itjust.works, and while i was able to upload the picture, i could not submit the post due to some other error :(
Are you using an app to try and upload? For some reason wefwef won't upload pictures for me either (not just in this community but in others as well). Liftoff (another app) or the browser do work for me. Which is a shame since so far I'm liking wefwef the most for browsing, finding communities and commenting.
Let me know if this solves the problem for you as well!