Can't upload or delete PDFs

I'm unable to delete or upload a PDF to our club's File Mgr. I searched for similar issues and found Peggy's undetermined issue: support.toastmastersclubs.org/5-support-...r-not-updating#55640

After hitting Refresh icon, I get:
Success! Information updated. Close window or select a new area to edit.

I closed File Mgr and reopened to no avail.

The nuance here is I'm trying to upload the same PDF file that already exists within File Mgr, but name it something shorter. I tried renaming file but won't stick so I decided to delete and re-upload. My goal is a shorter direct URL to give to out for public downloads.

On Win 10 PC, I tried both FF 54 and Edge browsers. Everything is cleared after closing browsers.

Any suggestions?

Thanks,
Talking Ideas Club #9375

which pdf ?

Both of these:
District_26_Consistently_President_s_Distinguished_Clubs__July_2015.pdf
District_26_reports.pdf

Also, we have a custom domain and I switched on Enforce HTTPS.

I used talkingideas.toastmastersclubs.org
logged in as Admin and was able to delete both files.

I see that they're gone now. But why doesn't this work when I login via https:www.talkingideas.org?

I tried with https:www.talkingideas.org and was able to upload and delete a file.