Two questions: 1\ media from a byte 2\ dynamic Meta with a JObject

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Two questions: 1\ media from a byte 2\ dynamic Meta with a JObject

Hi All, I have two short questions that I can't find a solution via google or stackoverflow:

1\ Is there a method to load media from a byte array rather than a path?
2\ How do you use the dynamic Meta with a JObject? is there a short example?
the only one I managed to get work is the following:
myPost.Meta = new JObject();
myPost.Meta["footnotes"] = $"{mystring}"; ... here I am not able to change the item name, for example: instead of "footnotes" to "customname"

Thank you very much to whoever will answer me
Regards
Luca