MacBook Pro Increase Storage

cts12b wrote:

How can I add internal storage to a 2017 MacBook Pro? I have 500GB, but would like to add more.

Sorry this is not possible.

You can trade the machine for one that suits you better or buy an external drive.

Apple Trade In - Apple

External Hard Drives and Storage Solutions for the Mac - OWC

Storage is soldered to the logic board of MacBook Pro models introduced in 2016 and newer, so you can't upgrade internal storage after purchasing.

One more solution not seen on the OWC site:

approximately actual size and 1/2-in thick on a short USB-3 cord with USB-C mini adapter. Bus powered.

What Grant Bennet-Adler pointed out is available at your nearest Best Buy.