@ram_k My advice is to upgrade to version Android iNaturalist version 1.23.18 (507) or higher. It reduces the amount of Userdata. Only the 100 most recent photos are stored, number 101 is deleted: ‘’ hold on to 100 of the most recently created local obs photos’'. ’ The figures just before and just after the upgrade:
Total: 9.44Gb–>1.33GB (euh??)
Userdata: 9.39GB–>1.27GB
Cache: 1.02GB–>1.02GB