Here on World of Banished, you can attach your screencaps straight from Banished in your posts. The attachments will be displayed as thumbnails in your post and when users click on the thumbnail a larger image will be displayed for them to see.
You are certainly welcome to keep using other sites for your screencaps and other game files but they can all be attached here if you want to instead.
Several image formats as well as zip and sav files are all acceptable.
Expand the Attachments and Other Options plus sign.
Look under the attachment textbox and you will see where you can click (more attachments) to add another attachment before you are ready to post.