Caption when sharing photos does not actually add text to the facebook post.

[Notion615]

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Bug Information

The "Caption" property for FaceBookSharePhoto.cs that is consumed by "ShareAsync(...)" method does not result in the text being visible anywhere on the facebook post when prompted to publish. This is also the case when using the "SharePhotoAsync(...)" method as well.

Version Number of Plugin: 2.2.1
Device Tested On: samsung Galaxy s10
Simulator Tested On: pixel 2 pie 9.0
Version of VS: 2019 16.10.3
Version of Xamarin:5.0.0.2083
Versions of other things you are using:

Steps to reproduce the Behavior

Expected Behavior

Actual Behavior

Code snippet

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