Unable to Upload

I tried to scan a document for the first time which has an only page, but I failed.

I have never used Adobe Document Cloud, so I have no idea why the storage limit has been reached and I cannot use the app.

All I want to do is to use Adobe Scan successfully for nothing. Could you let me know how to solve this problem?

(I'm just a beginner of English, so please forgive me even if there is a grammatical mistake.)