Can't Post Pics from Phone

Usually I post from my laptop with pictures uploaded to it, but had my phone and tried to make a quick post with a pic I had just taken. The "browse" button on the page shows an inversion when I tap it, but no box appears to select a file. I switched the browser to 'desktop' version and no change. I clicked 'desktop' version at the bottom of the Permies page, same thing. I went into security settings and switched from 'strict' tracking protection to 'normal', no change.

Any idea if there is a setting that would be preventing the website from pulling up a box to select files on the phone? Using Fennec on an old Pixel4 running LineageOS, a reverse engineered version of Android 15.