Image sequence stays grey

I am trying to import a bunch of images but when I select just the first image and click option, the ''image sequence'' option stays grey. The pictures are in good order and there is no number missing. What am I doing wrong?

I just want to get all the images in the right order in Premiere Pro so I can put them right after one another in a clip. If I select all and import they are not in the right order anymore..

Any suggestions would be much appreciated, this is for a school project 😞