Getting imported photos in Chronological order

Perhaps to minimize efforts already attempted, you may

list by what means you've tried to organize these images.

Organize files and folders in Files on iPad - Apple Support

//support.apple.com/guide/ipad/organize-files-and-folders-ipad

View and modify files and folders in Files on iPad - Apple Support

//support.apple.com/guide/ipad/view-and-modify-files-and-folders-ipad

Set up and use iCloud Photos - Apple Support

//support.apple.com/en-us/HT204264

Transfer photos and videos from your iPhone or iPad to your Mac or PC - Apple Support

//support.apple.com/en-us/HT201302

In previous usage, find (in Mac) all items are in a folder; I select All and

choose to set an order method, using options in sidebar or finder menu.

I've not used an iPhone nor an iPad to choose to re-order; in previous

digital image handling methods, I've edited them in macOS / OSX.

So if you've attempted to change item order in a folder, top-down, this

method should work; try & arrange to preferred type of order. Options

may include by Size, by Type, or by Name; their order might be correct.

Table of Contents - iPadOS User Guide

//support.apple.com/guide/ipad/toc/16.0

Did you import them into the Photos library or the Files app?

If the Photos library, which view are you using (Days, All Photos, Imports, Recents, some user Album) when you see them out of order? Be sure to check in the All Photos view to see if the order there is right.