Hi,
We are very sorry to inform you that it is not possible to add image on comment on activity stream. And it is an RtMedia related issue. RtMedia does not support this features. However, you can upload media in group and activity stream using the following setting in the screenshot below. Please see the screenshots for seeing the setting. If you have any more question about rtmedia features and support, you can get best answer asking your question in their forum. If you any question related to our theme, please feel free to ask.
Thanks,
Kamal
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