Hi @kjiandan,
Welcome to the community and Thanks for posting!
Adding to Loney’s, you need to notice that while you cheat by renaming the images with ####.jpg naming convention, make sure you have at least 5 images in the sequence. RV will not recognize less than 5 images as an image sequence even though they follow the naming conversation. You will see the error message if it’s less than 5.
If there are less than 5 images, you could drag/drop them into RV and then go to File->Export->Quicktime movie to convert images into a mov file and then either reload the mov into RV to submit with RV Submit Tool or manually upload from Web App.
