Hi Everybody,
I submitted this issue to the issue tracker but I have not had much feedback from reallusion on this.
This issue is really hindering the workflow for our game development and I am trying to reach out to anyone and everyone on this issue, so apologies ahead of time if you see a repeat of this post elsewhere.
Here is a link to a video of the problem I am having.
In short, accessory data is not being saved to motion plus files, or transferred to 3dXchange when captured using collect clip:

https://streamable.com/sbdgy3

Please have a look and tell me if I am doing something wrong or if there is another solution.

Thanks all

Try this:

Since capturing the entire clip from frame 1 worked fine, do that.
Save that clip to iClone library.
Right-click your character and remove all animation. Make sure your timeline is at frame 1 when you do.
Add the motion you saved earlier.
Cut or collect a new clip as needed. 
Send that to 3DX.

Hi Rampa, thanks for the reply. Here is me attempting what you are suggesting:
https://streamable.com/smf28n

Any ideas?

An update to an update. The method above Rampa suggests actually does NOT work as described. Please see linked video below showing the workflow:

https://streamable.com/5odotr

I think this might be a bug, can someone from Reallusion please comment or have a look at this?

Thank you

You can send me a download link for the file in a support ticket, and I'll take a look at it.
https://www.reallusion.com/CustomerSupport/UserEx/QForm.html

Thanks Rampa,

Here is the Ticket ID: [196167]

Please let me know if you need anything else. I will provide a link to the project files once I can create a private reply.