attaching Resources to embeds doesn't upload the resource's file

[R3alCl0ud]

when you send a RichEmbed with a Resource for a thumbnail or image the embed gets sent but the image/thumbnail is left out.

Although this doesn't happen if you pass the returned value from Resource#getFile() to RichEmbed#setThumbnail(File file) or RichEmbed#setImage(File file).

I believe the issue resides in DLUtil#readAllBytes(Resource resource), the issue is most likely a result of a possible inconsistency in how InputStream#read() has been implemented in FileInputStream and URL#openStream().

On the other hand, there might just be an issue with the fileName in the file upload payload.