Steam disk write error

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The original was posted on /r/linux_gaming by /u/isthehum on 2023-06-27 10:10:15+00:00.

I am on Ubuntu 23.04 and using the flatpak version of Steam. When I try to install anything on my HDD I get a disk write error. I tried to give the app permission to the entire /media folder using Flatseal but that didn't work. How can I solve this issue?