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A connection error usually means there is a server side error, can you check the logs/output.log when uploading an image in the composer.
When user load avatar from imgur : error this operation is insecure
on firefox you have this error : 2021-01-15_08h56_42.png
on chrome 2021-01-15_09h32_55.png
when user upload an image in a post or for avatar, there is this error 2021-01-15_08h56_13.png