How to play Keynote on Apple TV withOUT streaming it

Sounds simple enough, except for one thing. Apple after the ATV1 eliminated the ability to store media files on the unit. If your ATV has internet access, I would save the presentation in H264 and import it into iMovie (I think Keynote actually has an export option to iMovie) then upload it to iMovie theatre. The ATV would stream it from there. It would stand alone.

This http://venturebeat.com/2015/10/25/heres-why-you-dont-need-a-64gb-apple-tv/ is a good explanation of the how ATV 4 storage is used by apps. It really is a cloud-oriented device. If you don't want to stream from the cloud, you could set up a local Mac server, and stream from it. Both ATV and server could be on a wired network, if WiFi is too unreliable.

I bought my ATV64 to accommodate apps and any future functional additions Apple might make to the unit. I owned 2 ATV1's and loved the fact video and audio could be stored locally just like a iPod. Starting with the ATV2 this is no longer an option. You can stream media via the internet or a local network with a computer acting as the server.

iMovie theatre is an app that streams video from iCloud. Movies can be loaded into Photos and shared to iCloud to be viewed on the ATV. Again it is streaming the video from iCloud.

There's no flashdrive capability on ATV 4. The USB connection is for software repair and possible diagnostics, not file storage. Sorry.

You may want to consider a totally different (non-Apple) solution using a small computer just set up to play a file to tje TV. I believe it would not be difficult, but you might need some technical support to configure the right components.

You might be able to use this https://www.macstories.net/news/vlc-now-available-for-apple-tv-our-first-impress ions/ app on ATV, with the video stored on a drive attached to the office router, if it includes a storage capability. VLC can apparently browse SMB (Windows-syle) shared file systems without requiring any software on the server, and most router drives use SMB. So, you'd be streaming, but only from a local drive.

I'm not sure if you have resolved this, but I wanted to record the following.

The VLC app, available in the TV app store, has a wide range of capabilities, one of which is to play a video uploaded to it and stored on the ATV. You activate a special mode, then use a browser on a computer to upload videos to VLC. The files are stored as application data in the flash storage, and they are played using the VLC player like any other video. The only catch is that, by Apple's rules, the files are temporary. If the storage is needed by another app, the files will be deleted. Clearly, in a static sales application, this will be the only app, and it will always be running, so deletion should never occur. Note that everything will be preserved during sleep, and the data should survive a restart, though the app would need to be restarted. So the conclusion is that you can store a video on ATV 4, and play it from there.

Actually your idea of a USB stick may be a better one. If the TVs are smart TVs they may have a built in video player. My Sony does and I was easliy able to play video files off a USB stick. Check the format required for the player. Putting the file on USB and using the built in player is alot cheaper and more reliable than setting up 2 ATV's.

How to play keynote on Apple TV

Hi. Could you describe your question in a bit more detail? Are you using Keynote on a computer or on an iPad/iPhone? Are you able to AirPlay or mirror to the Apple TV?