AppleScript in Mail: Save attachments with Save dialog

Hi everyone,

I am trying to create a Mail rule which executes an AppleScript. The script so far works fine, but only with a hardcoded path, in this example it's my Downloads folder:

using terms from application "Mail"
	on perform mail action with messages theMessages for rule theRule
		tell application "Mail"
			repeat with oneMessage in theMessages
				set {mail attachment:theAttachments} to oneMessage
				repeat with oneAttachment in mail attachments of oneMessage
					save oneAttachment in ("Macintosh SSD:Users:bjoern:Downloads:") & (name of oneAttachment)
				end repeat
			end repeat
		end tell
	end perform mail action with messages
end using terms from



I would now like to bring up a save dialog which asks for the folder to save to, but I already fail at my intermediary step of using a variable as the save path. This code works on its own:

set folderName to "Downloads"
set homePath to (path to home folder) as text
set saveFolder to homePath & folderName & ":"

If I run it, the result shows:

"Macintosh SSD:Users:bjoern:Downloads:"

But if I replace the hardcoded path with the variable saveFolder in my upper script, nothing happens.

Any ideas what I’m missing here?