Haan..study appPhysics wallah..usi ka pdf disapper ho rha done phone me

Phle a31 use kr rhe the .us me bhi issue aa rhi thi abhi a32 use kr rhe 3 din hue h liye hue new phone ab isme bhi yhi issue aa rha h..I'm student or mere notes pdf Mai file manager me ek new folder create krke dalta hu..24 hr ke undr kuch pdf rhte o...

Nhi nhi ..wo bhi off kr diya again I facing this issueAnd I'm student or mere notes hi dissappear ho rhe ..

Bhai Maine..sb kr liya even ki Maine reset bhi kr diya phone ko ..tb bhi whi issue aa rha

My files also automatically deleted within 24 hrs please help