All my local pdf files are gone

Hi, 

Today I have realized that all the changes made (e.g. highlights) in my local files suddenly dissappeared, the files are still here but without the changes. 

I have an android tablet and I normally download files from my linked Google Drive account. 

Recently I haven´t updated OS, software or the Adobe app; neither had any app crashes or system crashes. 

The only thing I noticed was that my google associated account changed, i.e., example@itesm.mx updated automatically to example@tec.mx , so I was asked to sign in again to my account inside de Adobe app. However files were local copies, are still in the local memory but without any of the changes.