I'm trying to figure out how to use Content Collector best. It seems that after I use it to place an object, the content vanishing from the Content Collector. Perhaps the problem is that I'm editing the object after I place it. Are there any good tutorials on the Content Collector?
This is probably what you need:
The default is that when you collect an asset and then place it in another place (another page, another file), that it drops out of the Content Collector. But there are two other options (circled below) where the content can stay in the Collector.
But, if you close the file from which the assets were collected, they will disappear. If you want longer storage, you should create a Library.