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Mix .. there are 2 types of Lenovo tablets .. one is Windows and the other Android. The Windows one should be a no-brainer, so can I assume it's an Android?
For most tablets, the tablet app is the first piece. If you use Google docs, you can call up a contract on the spot anywhere there is WiFI or if you use your phone as a hotspot. Otherwise, you need to find a viewer/editor compatible to the document format you use.
For video, best to host the video online (YouTube for example) and either use a browser on the tablet or download a compatible app (I have a YouTube app on my iPad .. there may be equivalents in Android).