The position of the NFC connector is really critical. Before removing the NFC connector from the old battery, make measurements from some reference points on the midframe, so you can reinstall it in the EXACT original position. If it’s not in the right spot, it won’t make contact with the two pins on the motherboard.
The flash is adhered to the battery as well. Be careful when pulling the battery away, or detach the flash first.
Had the pre-cut adhesive sheet for reinstalling the Moto X Pure’s back cover. It seemed like the most “original” option at the time. I tried and tried to get it aligned inside the back cover, but found it virtually impossible to do. You pretty much have to get it perfectly aligned and then stick it down all at once. If it makes contact with the cover before it’s perfectly aligned, it’s all over. You’ll never get it back off without destroying it.
After failing with the pre-cut sheet, I resorted to the die-cut strips and corner pieces. This worked just fine.