I don't use Google Photos, iCloud photos or any other (distant) cloud photos storage service.
All my 100 GB photos are stored on a hard drive connected on a NAS of my home router (of course, I have backup on other disks distant from home, etc. but that's another off-topic question...).
From my Android phone, how to easily browse the photos of my local network's NAS? With thumbnails, etc. like most photo browsers.
NB: my NAS is a DIY-NAS made with a Raspberry Pi, with a SMB Samba server, but I can easily install another server on this Raspberry Pi if needed.