Send uploaded file from registration form to admin

I have a site, where only eployees of a certain company may register and I need to check if users, that register to my sites are eligible to do so. So I check their email address: If they have an email address at the said  company, they are eligible, and the registration goes as usual. If they use a different email address, I display a file field, where they are supposed to upload a document, that proves, that they are employees for the company in question.
So far, this works fine, but I also need to send an email with the uploaded file attached to it to an admin, and after sending the email, I need the file to be deleted.
For sending the file, I tried to configure an auto action, which didn't work (maybe I do it wrong?) and for deleting the file after sending it, i hav no clue on how to do this. Does anyone have tips on how I could go about this?

So you need to send that file as an attachment to the email? Believe that should be doable. Below should send an email after a user registers.

Global
Triggers: onAfterUserRegistration
Type: Email
Conditions
Field: SELECT_FILE_FIELD_HERE
Operator: Not Empty
Action
To: YOUR_EMAIL_ADDRESS_HERE
Subject: Registration Verification
Body: [username] is attempting to register and requires verification.
Attachment: images/comprofiler/plug_cbfilefield/[user_id]/[var1_FILE_FIELD_NAME_HERE]

Replace FILE_FIELD_NAME_HERE with the name of your field. Once you've this confirmed working for you we can move on to trying to delete it after the email is sent.

ok, this worked like a charm, I was close, but I didn't take the path to the file into account....

Great! If you're still needing to automate deleting of the files after it sends the email that's also possible, but if for whatever reason you don't get the email it may result in the file being lost for a resend. I'm not sure what kind of review or approval process you have, but if it requires visiting their profile I'd recommend just deleting the file at that point.

That's a good point, I'm not sure either, since the customer wasn't very detailed about the requirements. Let me check this, before we go ahead