Send selected attachments on an email directly from Power Apps

[WarrenBelz]

Have you ever wanted to send only some of the attachments on your record via email to someone? The solution is actually quite straightforward, but requires a bit of trickery not evident in the picture below.

The attachment control is a standard item in a form displaying the attachments on a record (I called this one acEmail ) - there are no modifications to it. The check boxes shown however are in a gallery placed "on top" of the attachment control - I called it galAttach here. You may have to adjust the TemplateHeight to get it to "line up" properly with the attachment control. 

The Items of this gallery are

acEmail.Attachments

essentially a copy of the data in the attachment control.
Two labels are then inserted into the gallery with ThisItem.Name and ThisItem.Value and then hidden. A checkbox is then inserted (I called mine ckChoose) - it does not need to bound to anything.
Now the email button uses the Office365Outlook Connector (so attach it in your data sources) with the following OnSelect

Office365Outlook.SendEmailV2(
   "xxx@yyy.com",
   "Subject here",
   "Attached are the chosen files",
   {
      Attachments: 
      AddColumns(
         RenameColumns(
            Filter(
               galAttach.AllItems,
               ckchoose.Value
            ),
            "Value",
            "ContentBytes"
         ),
         "odata.type",
         ""
      )
   }
)

and it picks the values from the gallery (which has the same values as the attachment control), and attaches the content to the email.