Is there a way to mount a macOS formatted external USB drive with COSMIC Atomic? Nothing happens when I plug it in.
Is the USB drive maybe formatted with HFS or HFS+? If yes, do you have the packages installed needed for supporting Apple HFS, i.e., hfsutils and hfsprogs? You may check by running rpm -qa | grep hfs in a terminal.
Or is it maybe formatted with NTFS or exFAT? For NTFS that would be ntfs-3g and ntfsprogs and for exFat exfatprogs
You may want to check the filesystem with GNOME Disks or whatever disk management tool COSMIC provides. Just be careful not to format if you don’t want to loose data.
MacOS supports many mass storage formats, but recent versions use APFS.