为什么我不能一直从Pixlr编辑器中的外部来源复制和粘贴？

Our Pixlr Editor app is browser based, and it is also a Flash app, so you may be able to copy and paste in some situations, but for the most part we don’t support copy and paste across other apps or from your computer’s clipboard. What you can do is copy and paste between Pixlr documents, but that’s about the only time copying and pasting images will reliably work.