Movie Clip Editor Not Importing Sequence Correctly

I have a folder with an image sequence (1300 frames). When i click “open” to load the sequence, all of the images appear in the folder. But, it doesn’t matter if i select 1 photo, 500 photos, or 1000 photos, blender totally disregards the quantity of images i’ve selected and just imports all 1300 frames. Why is it even giving me the option to select specific images if it’s just going to import everything that’s in the folder, regardless?

p.s. i’m not talking about picking frame one, then frame 6-100, then frame 355-500, for example. I just want to select frames 30-300, all in sequential order. I used blender to create the image sequence, so they’re all named exactly the way blender named/numbered them.