If a photo file sent from iPhone/iPad is in HEIF (.HEIC) format, it can be difficult to view properly because Android devices do not support that file format. HEIF-formatted photo files can be found under the Files tab, not the Photos tab in the Send menu in Send Anywhere app.
To open HEIF-formatted photo files you receive, you'll need to use a viewer app that supports the HEIF file format or use a file conversion app.
Alternatively, you can ask the person who sent you the photo to resend it after enabling Convert HEIC to JPG setting in Send Anywhere app on iPhone/iPad.