The All photos section contains all your photos in JPEG format where the date they were taken is indicated. This section also contains photos and videos that were automatically uploaded to Yandex.Disk from other devices.
To find a photos from a given time period, tap in the upper part of the screen and select the appropriate date.
You can share or delete photos, as well as make changes to them using the editor. Just open the photo and select from the available actions at the top of the screen.