I don’t know if this is the right section but I just found a way to access files with any extension (including PDF) also in the mobile app! you just have to sync via Google Drive, upload the file in gDrive (by simply moving the file to the Google Drive folder in Windows Explorer), right click on the file in google drive, click “copy link to clipboard” and paste the link in Logseq. Finally, Logseq will ask you what app you want to use to open that file. Choose the right app et voila! You can link anything: PDF, DOC, XLS, CSV etc.