If anyone is looking at this issue to try and figure out how to add support for pasting images into the textView, here are a couple of tips:

Turn on support for pasting images:
textView.pastableMediaTypes = .images
Override didPasteMediaContent():

override func didPasteMediaContent(_ userInfo: [AnyHashable : Any]) { 
    guard let pasteUTI = userInfo["SLKTextViewPastedItemContentType"] as? String,
        let pasteData = userInfo["SLKTextViewPastedItemData"] as? Data else {
        return
    }
    if let image = UIImage(data: pasteData) {
         let attachment = NSTextAttachment(data: pasteData, ofType: pasteUTI)
         let attrString = NSAttributedString(attachment: attachment)
         textView.slk_insertAttributedText(atCaretRange: attrString)
    }
}

2.5) you may need a UTI helper class like SwiftUTI to help with converting UTIs and mimeTypes
3) You may want to insert a thumbnail instead of the full size image; if you do you may want to subclass NSTextAttachment to contain the original UTI and image data
4) on send, you will need to figure out how to send the combined text+data, or pull out the attachments and send separately. There are some useful functions like slk_hasImageAttachment() in #120 to use as an example.

NSTextAttachment Support #225

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