@Richard Jackson Thanks for reaching out.
When you are using When a new email arrives (v3) action you can use the below configuration and in case if you are using different trigger then please let me know.
I see that you have used the current item of the for loop, but you should use the Attachment Content.
For each loop you should use the Attachments and make sure you have selected Yes to Include the attachments.
In case you are in general designer view:
In case if you need any assistance then please let me know.
Please click on ''Yes" if it helped so that it can help others in the community looking for help on similar topics.