Appendix B: Managing files
https://target_domain.quickbase.com/up/DBID/a/rRID/eFID/vVIDIs that helpful at all for this?
The part you mention "rb33r" or similar is the record id encoded with QB32Encode(), they also have a decoding function. I checked and QB32Encode(59183) = b33r, the r is added on to the front by Quick Base as well. I pulled the record id from your screenshot.
This is something else I've seen done too. You might be able to just insert the record id instead of the encoded one.
"https://team.quickbase.com/up/bdb5rjd6h/a/r"; & [Record ID#] & "/e8/v0"