By john 
It is a counterintuitive sequence. The app asks for a permission, you grant it, and the app immediately closes. Deny it and the app runs, albeit without the feature. This makes no sense until you understand rajaong that granting a permission triggers a code path the app may never have tested properly, and that path is where the crash lives.
What Is Likely Causing It
- The app restarts its process when a sensitive permission changes, and a bug in that restart sequence causes the crash.
- The permission gives access to a resource such as storage or the camera that another app is currently holding.
- A corrupted app cache means the app cannot write the state it just gained access to.
- A device-specific incompatibility appears only once the app reaches hardware it previously could not touch.
- An app targeting an old Android version may crash on the newer permission model entirely.
First Steps to Try
- Restart the phone, then open the app fresh with the permission already granted rather than granting it mid-session.
- Clear the app’s cache from Settings, Apps, the app, Storage. Do not clear data yet.
- Update the app from the store, since this class of bug is usually fixed quickly once reported.
- Close any other app that uses the same hardware, such as another camera or recorder app.
If the Problem Persists
- Clear the app’s data as the next escalation, accepting that local settings and logins will be lost.
- Uninstall and reinstall, which resolves a container damaged by an interrupted update.
- Check whether an older version is available if the crash started with a specific update, and report the issue to the developer with your device model.
- Boot into safe mode and test, since another app interfering is a real possibility worth ruling out.
Safety and Data Warnings
Do not download an older version of an app from an unofficial mirror to work around a crash. These sites are a primary distribution route for repackaged apps carrying malware, and a modified build with your credentials in it is far worse than a missing feature. Back up anything stored only inside the app before clearing its data.
Conclusion
A crash on grant is a bug in the app rather than a fault in the phone, and clearing the cache plus updating resolves most of them. Escalate to clearing data and reinstalling only after that. Report it to the developer rather than hunting for old builds on unofficial sites, because the cure there is worse than the disease.