Make sure that each still‑image filename has the correct filename extension. All filenames in the sequence must contain an equal number of digits before the extension for example, file000.bmp, and file001.bmp.
Do one of the following:
Click Add Media and choose Files And Folders.
Choose File > Add Media From > Files And Folders.
Locate and select the first image in the sequence. From
the Files Of Type menu, select Numbered Stills, and click Open.
Adobe Premiere Elements interprets all of the numbered files as a single sequence.
Note: For information on changing the duration of images, see “Set duration for imported images” in Help.