Dragan,
Thanks! Before I saw your post, I made the following changes.
1) Went to hostmonster and set php to version 7.3
2) Turned off the Yoast SEO plugin. I found that on the Dashboard / Site Health Status the status was busy. At the Site Health Screen / Info the Directories and Sizes was busy (spinning circle). When I turned off Yoast SEO, this was no longer busy and the Site Health Status page was also not busy. That page now showed a status.
I now see the files in Media / Library.