I deleted the reference to "thanks.php" in ful2_1.php, per your instructions, and I added the PHP code in at the top of both ful2_1.php and WAUE_ful2_1.php (not sure it needed to be at both, but thought it wouldn't hurt). And, I left the encoding type as "multipart/form-data", i.e., "enctype="multipart/form-data" in the form statement in ful2_1.php. After clicking the Submit button , I get nothing, except that the screen displays the data I had input into the Info field, but the data in the File field is cleared. (I.e., same as noted in my earlier comment.) And no other info is displayed.
Going to the next step, I then changed the encoding type to be blank, which eliminated the "enctype="multipart/form-data" parameter in the form statement which resulted in me getting the email, but no attachment AND the screen is as noted above (since it doesn't go to thanks.php).
NOTE: In the other forms that I have in my website where I used FB to create the forms, the encoding type is blank, not "multipart/form-data", and I do get those emails just fine. However, all those forms have just text, textarea or checkbox group data, not file attachments. They all work fine with the encoding type being blank, i.e., not indicated in the form statement. Thought I would pass this information on to you in case it may be relevant.