@Jim61
Yes, you can use a USB ethernet adapter to make the the Express 4k+ ethernet capable/wired.
The following Roku Support article provides some compatible adapters.
How to use USB to connect your Roku streaming device to a wired network
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Users have gotten other adapters to work other than what is on this list. To maximize compatibility, try looking for one that supports 10/100 and has chipset AX8877X or SMSC95XX. (Some have reported that some 10/100/1000 adapters will work, but if you stick to the recommended 10/100 with the above chipsets, you should have no issues). The (X) at the end of the chipsets will be numbers when looking at specs.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102
