Are you perhaps using the snap of "Czkawka" ? In that case you need to give it permission to access removable media. So you can either enter
Code:
sudo snap connect czkawka:removable-media
in a terminal or remove the snap and use the AppImage. Snaps are normally forbidden from opening files outside the home directory of the user (except for snaps running in either developer or classic mode). They are also not allowed to access hidden files and directories directly in the users home (normally not a problem; those are mostly configuration files for non-snap applications and there's no good reason one application should access another programs config).
So it's actually not a problem of the program but of the package-format. snap is not a good fit for this kind of tool.
Holger