Quick answer
Clean up a mixed PDF and EPUB library by finding duplicates, failed imports, temporary files, and items you no longer need. Do not delete anything until you know which copy contains your notes or progress.
Work in small batches.
Start with safe deletions
Old downloads you can re-download, obvious duplicate files, and failed zero-byte or tiny imports are good first targets.
Open the kept copy before deleting the duplicate.
Protect notes and highlights
Some reading data is linked to a specific file.
Export important notes when the reader allows it, or keep the exact file that owns the annotations.
Check backups
A backup only helps if it exists and can be opened.
Test a few files from the backup before deleting originals from the phone.
Repeat every few months
Small cleanups are easier than rebuilding a library after storage becomes full.
Keep the system simple enough that you can understand it later.
Detailed troubleshooting checklist
Work through the problem in this order: first check a mixed pdf and epub library itself, then the app, then Android or the device. Keeping that order prevents you from changing many things when only one part is wrong.
- Change one setting at a time.
What to remember
The answer does not need to be complicated. The useful result is that you can remove clutter without losing reading history or important files without repeating the same setup every time.
Repeat the return task from a fresh start
For “A mixed PDF and EPUB library: simple cleanup and maintenance”, simplify before you expand. Remove one source of confusion, then test whether you can find and continue the item faster from a fresh launch.
- For “A mixed PDF and EPUB library: simple cleanup and maintenance”, after reorganizing, close the app and repeat the same find-and-open task from the beginning.
- Try to find one current book, one older file, and one item you remember only by part of its title.
- Remove or rename obvious duplicates before adding more folders or tags.
What a good result looks like
For “A mixed PDF and EPUB library: simple cleanup and maintenance”, a good library setup lets you find, open, and continue reading without remembering a complicated filing system.
For this guide, stop adjusting once the workflow for “A mixed PDF and EPUB library: simple cleanup and maintenance” is clear, repeatable, and easier than the problem you started with.