Send photos on messenger
Why I can’t send photos in messenger by iPad?
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Wondering if this is Apple Messages or Facebook Messenger
and
what method you are using when you try to send a message, and whether you get an error message when you can't send, .
Try: How to: Send and receive photos, videos, and audio messages on iPad – Apple Support
or
Third-party (non-Apple) apps like Messenger may need to be updated for compatibility after each iPadOS update.
Seems you would also have enable access to your photo's in Facebook.
Eg: Go to Settings > Facebook to enable photos..
Then see if this article helps:
How to send photos with Facebook messenger:
https://www.wikihow.com/Send-Photos-and-Videos-with-Facebook-Messenger
All the best :-)