Stellar Data Recovery for Mac allows you to preview the lost/deleted files while they are being scanned. This feature allows you to locate the desired files quickly. In some instances, the preview function doesn’t work and the reason is file size.
In the demo version, the preview is only supported for files which are less than or equal to 10MB.
To preview files greater than 10MB, you would need the install the paid versions of the software (explore the paid versions of the software here). However, if the file size is more than 100MB, the preview feature won't function in any Stelar Data Recovery for Mac product