Techniques for synchronization for cross-context digital item containers and collaboration are provided, receiving a user command to share a particular digital item from a first portfolio of digital items with a second portfolio of digital items. In response receiving the command to share the digital item, making a digital copy of it and placing it in the second portfolio of digital items. Subsequently, an alteration is made to the digital item and a determination is made with whom to share the alteration among those with whom the digital item had been previously shared. Those alterations can be accepted (or rejected) by the other portfolios. When they are accepted, they are applied to the digital copy.