To export back to CC3 you must export the character from CC3 in such a way that the FbxKey is generated with it. i.e. Fbx Options: Mesh only.
Edit: Also, very important: uncheck embed textures, uncheck delete hidden faces, uncheck bake diffuse and specular maps.
If there is no Fbx Key, the button is greyed out.



There's a link to it buried somewhere in the Blender pipeline page.
or just go here: https://github.com/soupday/CC3-Blender-Tools-Plugin
Some people have trouble installing it, as dropping files into the program files folder is not a user friendly process, so I've made an installer for it. It's in the release page: https://github.com/soupday/CC3-Blender-Tools-Plugin/releases
See if that works.



That's a concern, the standard character should produce no errors at all. Was it the default CC3+ character (the one loaded in at program launch)? Or one of the sample characters? Also what version of Blender are you using? The add-on is tested for versions 2.83 to 3.0.


Now onto the real problem:


Ok. I have that pack so I can test it...

...And can confirm there is a problem with the cartoon base characters and the add-on. It's a simple fix I'll push that out after a bit more testing.

I'm getting pretty desperate. Seems i've been posting issues on the wrong platform. Reallusion support is failing also. Someone told me that the guy responsable for the Blender Auto setup is monitoring the forum and  will be ready to help. So here I go (again). I have to major issues with the CC3 > Blender and viceversa Pipeline:

-Why is my 'export to CC3' in the Blender CC3 tab greyed out? No matter what I try (different models, minor adjustments without ruining the mesh, etc...) This button stays 'greyed-out'.
-Why does my CC3 version lack the functionality of importing Blender files (looking at tutorials this should be possible from the plugin/blender_import menu. 

In some tutorials I see other functionality in the CC3 tab in Blender. For instance 'import morph object'. But maybe this is a previous version of the addon. There is also an offical Reallusion tutorial that starts with a basic CC3 character that was heavily modified by sculpting. I'm able to do this but I can't get it back into CC3 with the pipeline due to the greyed-out export button. Hope I'll finally get an answer and some help. This is real frustrating to be honest.

Thanks in advance.

Did you read the replies from the Victor.Soupday in this post and this one? Have you downloaded the latest versions that he linked to?

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

Thank you for all your answers and support. It seems I've missed your reply to me completely. I appolgize! This will help me further!

Hi, I now tried it with everything selected in the outliner. No result. The ''Export to CC3" button still is greyed out. I really have no clue why this is happening. It's driving me crazy.
The CC3 > Blender pipeline should be easy...for me it's not...

From that screen-shot I can see two things:

1. You are still using version 1.1.8 of the add-on. Upgrade the add-on to version 1.1.9 and it will set up the materials correctly.
You can update from the Blender preferences: Menu > Edit > Preferences



This will check for updates and give you the button to upgrade to the newest version. You will probably need to restart Blender after upgrading.

2. The pose of the character shows it was not exported (from CC3) as mesh only. Which means CC3 will not generate an Fbx Key, which means it cannot be re-imported back to CC3.

Use these settings, Exactly, to export from CC3:




If all has gone correctly it should look like this in Blender after importing:

Thank you! I will give it a try.