Slack snap can't handle filenames containing é characters

Hi,

I’m running the Slack app on Ubuntu 20.04, and I can’t upload any image whose filename contains an é accent.
for example Capture d’écran de 2020-06-10 23-15-01.png

I’m getting the following message:
Capture%20d%E2%80%99%C3%A9cran%20de%202020-06-11%2017-34-00

Ce message means:
Sorry, is a filetype that Slack can’t handle. Try to import a .zip version of this file

Obviously, the filepath is missing from this sentence, meaning that the Slack app receiving nothing ??

Can you fix it ?

Thanks