Format of the file. Some files can have different formats (please see FlmngrFileWithFormats).
The list of formats of this image if you requested them by using imageFormats option.
Full URL of selected file. Uses urlFileManager as a prefix (you pass it as config when create Flmngr).
When you call Flmngr.pickFiles method you can specify
imageFormats. This is a list if IDs of image formats you pass inside Flmngr config when initialize it. So when you specifyimageFormatsoption, Flmngr will return not just an image, but also all image formats (images in another resolutions) you asked for. In this case inside each returned file (FlmngrFile) you will haveformatsfield with an array of such images.