TL;DR: if something not from Amazon is delivered by Amazon Spain, it's a PITA and the recipient has no control over delivery.

I recently had one delivery sub-contracted to Amazon Spain, it was a nightmare. I was not able to choose a different date (only the original delivery company could, but they didn't answer me at all), not able to choose a pick up point (for the same reason), not able to correct the address that was slightly messed up. They emailed me that the parcel is up for delivery in 10 days, and delivered it next day after the email, probably 1 and 10 are close enough.

It's a lucky thing they even called me, I was away for several more days and couldn't receive the parcel. The support said they will usually make three delivery attempts and then send back, but that they may do more or less attempts. Also they responded that I should give the seller some time to respond to my inquiry about moving delivery date, but they will continue to try to deliver and maybe fail and send back.

By the way, the original delivery company never replied at all, if I were unable to finally catch a delivery I would be out of luck. Also, the delivery window is 10 AM to 10 PM, no details, just wait and hope