After an Android software update, commands and features are sometimes moved around, work differently or not at all. When this happens, there will be another update sent out to fix the issues. Please be patient while it's worked out. In the meantime, please see this app for more details: https://community.verizonwireless.com/t5/Samsung-Galaxy-S-Series/Message-gifs-not-working/m-p/110947... 

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