Hi Kim - I’m using a 4th generation iPad Pro (M2 chip) with 256GB of RAM, USB-C hub with USB-C connected SSD and card readers. I use the files app to backup from the card to the SSD. I don’t import into the Photos App. I browse with Apple’s Files app if I want to look through the shots, but I rarely do so while traveling. I prefer to just backup and do the cull and edits when I’m home. If there are shots I know I want, I locate them using the Files app and import to Lightroom. Speed wise, this setup is the fastest I’ve had for an iPad Pro. It’s in the ballpark with my MacBook Pro and Mac Studio. I zoomed in on that photo and 5.71GB took ~100 seconds to copy from SD card to SSD drive using the Files app.
For power, rarely do I not find an available A/C power outlet. I keep an iPad cable and power brick or Mogics Super Bagel (
https://www.mogics.com/super-bagel) in my backpack so I can plug in pretty much anywhere in the world. If A/C is not available, I have a small battery pack for charging phones, AirPods, etc with me, too. I don’t carry these things all the time, on day trips they’ll stay back in the room, but for those time when I’m going to be burning through the memory cards, I will pack one or both for the day.