Theoretically, there is no limit on the size of file you can upload to your LightRocket platform.
As a rule of thumb we would recommend your hi-res image files be not less than 3000 pixels on the longest edge. Files of this size will be perfectly usable for publishing in various formats.
But of course LightRocket isn't limited to photos. You can upload almost any digital file you can think of - and if we don't already handle a format, we'll simply add it.
You can choose between LightRocket's built in drag and drop uploader - which handles bulk uploads just fine. We can even re-queue failed uploads.