How do you send a photo from your photo files? The enter key does not act as a submit key
There are a number of ways you can send a photo from the Photos app on your iPad.

To send photos, you can:


Launch the Photos app
Tap on the photo you want to send (or, in the case of multiple photos, tap on the Select option and select the photos you want to send)
Tap on the share icon (see image below)





Now select how you want to send it (e.g. via Message, Mail, etc)


You can also send photos directly from within apps. By way of example, you can compose a new email message and tapping on the screen will give you the option to Insert Photo or Video. Doing this will open the Photos app from where you can select the photos/videos you want to attach to your email. Likewise, within the Messages app you can tap on the camera icon to be presented with a choice of taking new photos or accessing existing photos in your Photos library.