Hi, try this. In the import panel ( doesn't work in the media browser ), select only the first image from your sequence even if the sequence option is grey, and clic Import.
If it doesn't work try this. Import all your images in a folder/bin in PPRO and on the lower right corner of your Project panel on the left of the Maginfiying icon, you'll find the "Automate to sequence" icon. Select all your images or directly the bin/folder and clic on the icon.You'll have many options but if you only need a sequence with the original frame rate, choose "Frame per Still" and get rid of the " Apply default video Transition" option. Let us know if it helps with your edited footages.