We have to upload 512 images. In our folder 512 images are there. But, only 53 images are getting uploaded. We have to do annotation only. In free account, I think there is not limit for number of images for annotation.
As far as I’m aware, the limit for the free plan is 10,000 source images, so that shouldn’t be the issue unless you have more images in your other projects in the same workspace.
Are any of your 512 images the same or similar? If so, they might be getting deleted due to that.
Roboflow utilizes similarity matching to filter out duplicate or nearly identical images from your dataset
from Roboflow Knowledge Base: How are duplicate images counted in my usage?