I have a question about getting paid to watch videos

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I am with several work at home sites. Most of them pay me to watch videos. And I love those videos. The problem is that many of the videos are the same videos that I have seen on other sites. I have already watched them on another site and there is often a message that says something about only getting paid to watch video once. I have no problem accessing the same video and watching it later on a different site.. I do not get any message that I have already viewed video and will not get additional reward If you watch the same video on different sites, do you get your reward for that site? It is difficult to tell because I am not always instantly rewarded plus each site that I am on offers a different type of reward.