My browser says (in F12 console of firefox):
SyntaxError client.js:2:1170023
hw https://лемми.опенсорс.рус/static/0799f19b/js/client.js:2
the file starts with
/*! For license information please see client.js.LICENSE.txt */
(()=>{var e,t,n,r,o={45850:(e,t,n)=>{"use strict";n.d(t,
and DeepSeek says that e,t,n,r,o should be separated by spaces, i.e. e, t, n, r, o
The lemmy.ml instance adds that image without problems.

Ok, what I should do to fix the “Syntax Error” message during image uploading?
I would start by deploying non-minified scripts, and with the error/exception thown, set breakpoint in the previous stacktrace step. Then, reload/repeat, and follow the logic step by step until the exception stage.
It’s a bit illogical. I have exactly the same version as lemmy.ml. But their instance works, and mine - doesn’t.