why did my screenshots disappear?

I just realized all of my screenshots disappeared off my galaxy S4. i have 8 from the past two days. I have google plus and only those 8 are there also. I went into files and looked for screenshots and only those 8 are there. I know I did not delete them all. I don't even know how to! Why wouldn't they be in google plus?

Welcome to Android Central! Are you saying that screenshots that were taken earlier than 2 days ago are all gone? Are you looking in the directory /Pictures/Screenshots?