Make a discussion, list your issue in DETAIL, also test your own game with SMH as the only active add-on to ensure your collection of add-ons aren't screwing with the mod itself. It's hella simple.

For the basic keybinds, refer to the tutorial video on the main page.

Passive aggressive comments and RP talk in said comments aren't getting you any closer to possible problems being fixed. Seems hard to believe but, yes, most issues are largely user-end. Check your setup first.

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(AUTHOR'S ORIGINAL FAQ)
Q: Why can't I select more than one entity?
A: In the new version, entities are selected for editing their frames. All entities that have any recorded frames are animated automatically, when the playhead is moved or when smh_playback command is used. So if you select one entity, record frames, select another, record frames, both of these entities will be animated.

Q: SMH isn't playing facial animations?
A: If you have the faceposer tool open, it will override any facial changes made when you move between frames with SMH, so you need to unequip the faceposer tool to see the changes.

Q: Command x doesn't work, and I'm getting x error
A: First, make sure the command you use is correct. Most often you may forget the + sign in front of some commands. Check the tutorial to make sure you are typing the commands correctly.
Also, SMH has only been tested on sandbox mode, and most likely doesn't work on other gamemodes. So if you are getting errors and you are not in sandbox mode, disable the addon. Otherwise, leave a comment below including the error you are getting.

Q: I can't understand the tutorial
A: I know my tutorial making skills are not that good, but if you have some patience to fiddle around with the tool, you get the hang of it and understand it better. There is also a video tutorial available, which can clear things up better.

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(COMMUNITY F.A.Q.)

Q: Where are my save files?
- Saves are stored within "GarrysMod/garrysmod/data/smh" as simple .txt files.

Q: I don't want to hold down a key for the menu, can I use a toggle?
- To make a toggle for the menu, you have to type "bindtoggle" instead of "bind"
(EX: bindtoggle x +smh_menu)

Q: My ragdolls dont move but their shadows do.
- If ragdolls are not moving but their shadows are, check and uncheck "Dont animate physbones".

Q: Can we keyframe material changes?
- Material changes cannot be keyframed. If you use the Material / SubMaterial tool on a model, it will keep that matieral throughout.

Q: How do I copy frames?
- Copying frames can be done by having the SMH menu open and clicking on a keyframe with the middle mouse button. You can copy multiple frames by holding CTRL and selecting your keyframes, then clicking middle mouse button and dragging to where your frames need to be.

Q: How do timelines work?
- Every model/ragdoll has its own timeline of keyframes. They can have multiple different timelines for different parts (Eye Posing, Face Posing, etc.)

Q: Can I set a key to toggle the menu open?
- Due to the way the addon was originally coded, BindToggle does not have any effect on "smh_menu". You will have to hold down the key.

When you begin animating on one model, the starting timeline includes every change and setting you have into that one timeline. To have it only change face posing or the like, go into the properties menu of the entity while you have it selected and click on "Timeline 1". You will see a drop down menu that includes all different trackers for that specific timeline. Uncheck the one you want to keep separate and make a new timeline with that option.

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Please keep respectful and always test your game extensively first.