Hi @adminKF ,
Are you “creating a default app based on the dataverse table” or “creating a blank app and add components manually”?
If you want to manage attachment in PowerApps, no matter how you create the app, you need to have at least an edit form and a display form to edit the attachment, and also a gallery to display all records(then you can edit a specified record to add one more attachment). I think you should first refer to below article to know more about canvas-app forms in Microsoft Power Apps:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/working-with-forms
Seems you are using a File column to keep the attachment files, I will give you a simple steps about how to manage attachment in PowerApps:
1. Create a dataverse table with a File column called “file1”:

2. Create an app based on this table. Go to the edit form page to add this File column:

3. Also go to the display form page to add this File column:

4. Go to the gallery page to add this File column:

After above actions, you can now save attachments in edit form page, show attachments in gallery page or in display form page.
Below is in a gallery page, I can see the attachment for the first record(other records don’t have attachments yet):

Below is in a edit form page, I just add a new attachment for “user2” record(when you go back to gallery page, you will see the new upload attachment):

Below is in a display form page:

However, descripted in this official document, “it only allows a single file for a File data type field. If you want multiple files, use the attachment feature”. So if you want to add more attachments for one record, you need to enable attachment feature for this table, then use above steps to add the Attachment column into your gallery, edit form and display form:



Best Regards,
Allen