Make sure instance members are always list value for publishing uasset/Uasset loader can load the uasset

[moonyuet]

Changelog Description

Make sure the instance members are always list value
Related issue: #65, #64, #63

Additional info

Please the PR along with this ticket ynput/ayon-core#859
And with this setting below or with the backend ticket ynput/ayon-backend#328.

name: unrealuasset
directory: {root[work]}/{project[name]}/{hierarchy}/{folder[name]}/publish/{product[type]}/{product[name]}/{@version}
filename: {originalBasename}.{ext}

***There are some limitations for loading the uasset/umap btw. You need to perform "delete" the files manually to make it visible. (which is strange) (6039c80)

https://github.com/user-attachments/assets/739cf10e-e119-470b-81c3-43d7504114eb

Demonstration:

umap_test.mp4

Testing notes:

1. Create UAsset/Umap/Camera Instance
2. Close the publisher
3. Open the publisher again
4. Publish
5. Should be published successfully without error.

[LiborBatek]

It doesnt fail on me when performing Publish for Uasset but results into just _CON entity in the publish folder.... is that correct??

and when loaded via AYON>Load

[moonyuet]

It doesnt fail on me when performing Publish for Uasset but results into just _CON entity in the publish folder.... is that correct??

have you tried with the related PR in ayon-core and ayon-backend altogether?

[LiborBatek]

@moonyuet nope, sry my bad....didnt pull those other PRs

[LiborBatek]

Ok with related ayon-core PR pulled together with this one, I was able to publish
Level uasset without any errors (by just using local data sitting inside that level not refering any external data (actors) )

and been also able to AYON>Load the published uasset level

LGTM in essence!