PDF file cannot be opened when installing Observer on iPad Air1 (mobile terminal 1.41) (iOS system version 12.5.6)

PDF files cannot be opened when installing Obsidian (mobile terminal 1.41) (multiple PDF files are attempted, all fail)

Expected effect
Subsequent versions can open PDF files and browse

Operating system: ios 12.5.6
Equipment: iPad Air1 (A7 processor released in 2013)

Solution Attempted
After borrowing someone else’s iPad Air5 to install the Obsidian (mobile terminal 1.41), you can open the PDF file system version IOS 15.6.1 (M1 processor)

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