Thank you so much.
My portal page hasn't changed at all. Still says completed and next action print application so I'm going to think you all are right and it was just triggered by biometrics on Thursday.
Seriously, stop worrying. It'll all be fine
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Your package hasn't even been delivered yet, so you should not have even recieved any emails yet anyway - it's UKVI's fault for sending you the wrong email.
You don't think anything wrong with shipping it both ways with ups?
No, it's fine to use UPS both ways - after all, the VFS Global shipping is just fixed-price, pre-paid UPS shipping.
However, I just realised that you said you paid both ways for the UPS shipping... not quite sure how you managed that, since you cannot create an advance international return label through UPS (it's not possible to know the weight and cost to return it back from the UK).
What you should have done was purchase the outbound shipping label through UPS, then created an online account with UPS and included your online account number with your documents. Then, when Sheffield processed the visa, they could have charged your online UPS account for the return shipping amount.
It shouldn't be too much of an issue, but you may find that Sheffield email you asking for alternative return shipping details if they find they cannot use the return shipping label you provided. In that case, you can either provide an online account number for UPS, or you could purchase a VFS Global shipping label and email it to them.
If this is the case, then you'll need to try to get a refund for the return shipping you have already purchased - especially as they shouldn't have sold it to you anyway, and instead should have told you it wasn't possible to purchase it.