gyazo uploadしたらログインを促す

easy_authのsigned_upパラメータを使う

https://gyazo.com/edc41827f7d26dd35fdaaa8243127560

https://gyazo.com/68749a9143a702736d764b14882fadf9

https://gyazo.com/c18fa93c887cdf0c25136e59b53c20cd

https://gyazo.com/e0d4804138c1b46e4022396dfa0dc148

https://gyazo.com/da7631ba47f6e59a2464b1e54538d9ce

https://gyazo.com/0aca32c362a98b1300f1d7e9c8adb8cf