How to sort photos by date uploaded within a Facebook photo album
Default in a Facebook photo album, the oldest photos appear at the top. If you want to set the newest photos appear at the top, you can drag and drop to sort photos. But you uploaded photos non-chronologically, so you may have must more time to do that to each upload.
To set the newest photo appear at the top, here are the steps:
Go to your photo albums and click the album you want to edit. Then there is a little 3 dots icon to the upper right corner of the album, click it.
From the 3 dots icon select Change Ordering:
Select the option Show most recently uploaded photos at the top.
Click onto Confirm button to save.