Why won't PhotoShop open jpf files anymore? (JPEG 2000) Last week they worked fine!

I am renting Photoshop on my Mac computer using Sonoma 14.4.1 and last week I converted some TIFF or JPEG files to JPEG 2000 (jpf) and they reduced the image size very well - even better than webp, but now Photoshop won't even open those files. What is the deal with JPEG 2000 and JPEG Stereo. How can I best reduce size of my photos (usually 4-7 MGBs to share on the web? HJELP!