how do you attach a picture
It is hard to believe what you said about the casino in the subject because they have clean records. For the reward you claim was scripted off from you, the title given to the reward/game does matter. Do you read the game/reward terms and conditions because some amendments are made at some point base on the number of participants to make the best user get the reward?
Terms and conditions are what's important in any game or reward hosted by a casino.
In the meantime, for the proof uploading what you need is a free online image hosting site like
https://imgur.com/uploadhttps://postimages.org/https://imgbb.com/