Using Solid Explorer on Samsung a54. Android up to date. Have a SanDisk 256 USB pendrive mounted. The kind with a flippable USB-C and USB-A connection. Using Solid Explorer in the trial version, I like it and wanna buy it, but I also want to figure this out. I have the three dots next to the USB drive where I can click unmount but when I click unmount it takes me to a Manage Storage screen for the memory on my phone. I have to switch to the native Samsung file manager if I want to really unmount the drive and when I do so it disappears from the sidebar on Solid Explorer as expected.

Am I not giving the app some kind of permission it needs? How can I fix this so I can do everything in SE and don't need to rely on the other file manager app?

Thanks for your help!