When I create an album in Photos, how do I keep the photos from rearranging when I move it?

You are missing that files have no order - the order is supplied by the viewer

In a album the order is supplied by the sort you choose in Photos - on a flash drive the order is supplied the the viewing program which on a Mac is typically the finder - with the finder you can vie files in many different ways including by name, date created, date modified, size, etc, etc

So to vie the files in a specific order you must set the correct parameters for the files and then set the viewing program correctly - the easiest way to view photos in a specific order is to export them (file menu ==> export) using the sequential naming option and then to view them by title

LN

again files have no order - the order is set by the viewer not by you

the easiest way to view photos in a specific order is to export them (file menu ==> export) using the sequential naming option and then to view them by name

if the viewer has a dfferent system and/or uses a different sort order they will get a different order

with the finder you can view files in many different ways including by name, date created, date modified, size, etc, etc

Files are just a bunch of bits on a storage device with a directory telling the file manager (the finder or windows explorer) what bits make up a file - the user set the order - in the finder look under view ==> arrange by to see the options - for the same flash drive you (the viewer) can look at them in any of those orders and there is nothing the sender can do except set metadata so one of those gives teh desirec result - the easiest is to the the file names as I suggested so viewing them by name gives the order you want

LN

I tried selecting all the photos in my album and then just moving them to a new album.

and once again the sort order is set by the viewer - each album can be sorted by photos date ascending or descending or by title - putting the same photos in an album with a different sort order is going to be viewed differently - to set the sort order for an album right click on the album and select the sort order - sort order is not an attribute of the photos, it is set by the viewer both in Photos and in the finder

LN

The Finder (which does the organizing outside of Photos) only sorts by File name or file date. Here's another method to get the order you want outside of the library.

Do the following:

1 - put the files in the order in Photos in an album.

2 - use this Applescript to batch change the Title to user selected text and a sequential following number: Photos for Mac - Batch Change Title to Text w/Padded Sequential No.

NOTE: You can download a compiled version of the script as an application from this tutorial: P01 - Applescripts from Photos’ User Tips Compiled as Applications

3 - select the photos again and export with this option: File Name: Use Title.

That will produce file names that will sort alphanumerically in the Finder in the same order as they were in your Photos album.

I wish "sort" had the option of sorting numerically, then I could just number them.

Which "sort"are you referring to? In the Finder? If so then clicking on the top of the Name column in a Finder window will sort the file alphanumerically. If you rename the files with 01, 02, 03, etc. and export with the Title as the Filename they will be sorted in the Finder as you'd like.

If you use leading zeros (a names like A001) then an alpha sort is also a numeric sort

LN

in Photos you only get the "sort by title" or date, not a numeric sort.

A sort by title is an alphanumerical sort.

and again

If you use leading zeros (or names like A001) then an alpha sort is also a numeric sort

the sort is alphanumeric

LN

You are welcome - good luck

LN