I'm sorry, seems I misspoke. It seems that when you look at an album in Photos you can select all; if you're in the camera roll or elsewhere, you won't get that option. Not sure why Apple would do that, but maybe they'll change it with the Photos rework in iOS 18.

As an alternative, here's a tiny script through iOS' Shortcuts app that selects photos in a date range and sends them to a Samba share through Files.[1] This time I actually tested, and was able to successfully run the Shortcut to copy a date range of photos/videos from the Photos app to my Samba share.

Quick instructions, in case you need them:

1. Create a new Shortcut and add a "Find Photos" module (You can search with the bar at the bottom). Add a filter, set it according to the screenshot[1], starting from "Date Taken" and ending at the stop date.

2. Add a "Save File" module beneath the Photos module (icon visible next to "Save Photos" in the screenshot). Shortcuts should auto-populate the selected photos as a variable so it reads "Save Photos". Hit the ">" next to "Save Photos" and tick any options you need.

3. Make sure to modify the date range each time you need to run the Shortcut.

You can also add/modify filters in each module to better suit your needs. For example, instead of "Date Taken" you could select by "Creation Date", or add in a "Media Type" filter so you only return photos and not videos (or vice-versa).

One thing to know: There's no progress bar so it's helpful to run the Shortcut from the Shortcuts app so you can see when it finishes executing/transferring. You should see a little 'stop' button with a semicircle around it when a Shortcut is executing from the app; it'll turn into a '...' button when it finishes.

[1] https://i.imgur.com/LPsQ8au.jpeg