SDMITCH! After searching for hours, I finally found your script and it does 90% of what I was looking for. Thank you so much!!! This is the closest thing I have found to a batch material import for 2019. I still have to save the skms back to the folder i want and then upload the collection, but bringing the images in into sketchup is the real timesuck.

Old post, but here is an update for those having difficulty. Use this script in conjunction with:

http://sketchucation.com/forums/viewtopic.php?t=7638

The two combined are brilliant! This is especially true for those that use proper layering techniques, but receive models from Revit Exports.