[dbrown1029]

If you already backed up your library, uninstalled the Microsoft Store version, installed the FastSpring version, entered the license key and restored your library, you can then go to the Windows Settings->Apps->Installed Apps->MobileSheets, click the three dots and Advanced Settings, then just toggle on "File system". MobileSheets will then have access to the entire file system and should be able to open files from any location. 

Mike

Thank you, Mike. I've made some progress. By adding the hyperlink directly in Adobe (as a hotspot) instead of in the original Word document, I have managed to remove the extraneous path information, but I am still getting the File access error message (even after toggling the "File system" in Windows), whether using the original location for the file or a copy of the same file in the Library folder. I'm also still getting that weird "page 1". Could it be related to that? Do hyperlinks in MS maybe only work for specific file types like PDFs? 
  Dave's Gig Program - Pop-Rock mobilesheets test.pdf (Size: 201.37 KB / Downloads: 7)