I would think it would be alright to add as many as you wish, unless you have a small amount of system RAM, you might just want to go slow. Ah, saving/backing up, VERY important! You can select a catagory, and then selct what mats you want by the same way you would select files in Explorer, with shift or ctrl + click. When you select them, a hard to see red outline will appear around each .mat thumbnail. When you have all the ones you want selected, just export to another location for backup purposes. AS

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