Uploading Pictures to Albums / Rearranging

[TWGB]

Quick technical question:

When I created an album today, I uploaded the first few pictures 5 at a time. The order that I selected them was deliberate, but when they appeared in the album, that order had changed.

Is it something I'm doing (inadvertently), or is this a feature?

I corrected the order by deleting the out-of-sequence ones, and ended up uploading 1 or 2 at a time.

Three questions:
Can I dictate the order of pictures as I upload them?
If so, what am I doing wrong?
If not, is there a way to rearrange pictures with an album?

Thanks in anticipation; best regards,

Tim