@fadel13 OH Ok... I can reproduce the problem... Do you have a gallery from which you browse Form?
If yes, try the below:
Step 1: Create one gallery for your SharePoint list, and create another gallery for your SharePointt attachments. align these two galleries side by side, or however you like to design your form.
Step 2: Change the Items property of your second gallery to firstGalery.Selected.Attachments

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!
P.S. take a look at my blog here and like & subscribe to my YouTube Channel thanks.