hey,
what device information did you send to Google drive?
Cleanup can upload to cloud pictures, videos, music and any other files which are not part of any app. Those files can be found on Google drive in folder AvastCleanup, folder structure under this folder copies structure on device.
Cleanup cannot reach files that are already on cloud storage, you have to use web interface of Drive or its Android app. Cleanup deletes files after transfer to cloud only if it gets confirmation from cloud service.
Regarding the Select all problem, can you please specify what category are you talking about, how many files it contains.
Also would be nice to know what android version, app version and device are you using.
Thanks