Aren't their existing commonly used file sharing solutions for law which should implement a version of this? I would imagine it makes more sense as a feature there than it would in a whole new app.
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The DMS providers have a great business and their product is stickier than glue. Fortunately, they are very startup friendly and have built out a whole app store ecosystem so other companies can layer on new capabilities that deepen the value of the DMS and make it even stickier.