Assuming you named your images sequentially, for example "frame-0001.jpg", "frame-0002.jpg", "frame-0003.jpg", etc., go to File / Open, browse to the folder containing the images, click on the first one, then check "Import image sequence in the bottom left corner. This will load all the images as a single video event at the current project frame rate. Assuming the project frame rate is the same while you import that it was when you exported the frames then the new event will run at the same speed as the original video. Will it be in sync? That depends on where your cursor is when you do the import. If you exported the entire timeline and your cursor is at 0 when you import, you should be fine. Otherwise you should position the cursor at the same frame where you started the export before importing. At worst, you may have to slide the event left or right on the timeline to line it up with the audio.

Things that could go wrong:

- The import function sorts the file names alphabetically, not numerically. Therefore "frame-182.jpg" comes after "frame-1265.jpg". Make sure that the frame file names all have the same number of digits and are zero-padded for the shorter numbers. If you have 28000 frames (just for example), the numbers in the names all have to be 5 digits and you would have to start with "frame-00001.jpg" instead of "frame-1.jpg".

- If you are missing any frames in the sequence the import function will stop at the missing frame. If you decided to delete "frame-03954.jpg" for whatever reason, the import will stop at "frame-03953.jpg". You'll have to do another import manually starting at "frame-03955.jpg" to get the rest of the video.

- If your import frame rate differs from the export frame rate then the imported video won't run at the right speed. For example, if you captured your video at 29.97fps, exported it, then decided to import into a 24fps project, the video will run about 16.7% slower since each original frame will get mapped 1:1 to a new frame. You can adjust for this while importing, but it's better all around to just keep the same frame rate to being with.