Quick answer
For local documents, check whether the app keeps books, notes, progress, and search history on the phone or sends them to a server.
Privacy depends on the reader and any external service you use.
Read the privacy page
Look for clear statements about analytics, ads, accounts, cloud storage, and sale of data.
Check sync
Sync can be useful, but it means some reading data leaves the device. Decide whether you want that trade-off.
Be careful with converters and lookup tools
Uploading a private document to a converter or web service follows that service’s privacy rules, not your local reader’s rules.
Use local tools for sensitive files
If a document is private, prefer local reading and local processing when possible.
If the first fix does not work
Try another known-good local documents example. If the second one works, the first file or item is probably the problem. If both fail in the same way, the app, phone, or setting is more likely.
Detailed troubleshooting checklist
Work through the problem in this order: first check local documents 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.
Test the full flow without a network
For “Privacy checks for local documents”, after the needed file or optional model is downloaded, disable the network and repeat the whole task from a fresh launch. That is the simplest way to catch a hidden online dependency.
- For “Privacy checks for local documents”, keep important source files in a folder you control instead of relying on a temporary download location.
- If privacy matters, separate local reading behavior from optional network features and test each one deliberately.
- Open the item, close the reader, and reopen it while still offline so cached screens are not mistaken for true offline access.
What a good result looks like
For “Privacy checks for local documents”, offline reading is dependable when the full task still works after a fresh reopen with the network disabled and you know which optional features need internet.
For this guide, stop adjusting once the workflow for “Privacy checks for local documents” is clear, repeatable, and easier than the problem you started with.