For best practices on using Instagram to reach new communities, see:
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So far we focus on using Flickr… should we be more focused on Instagram?
Personally I’ve always seen Flickr as a good place to document our events, uploading whole albums of our photography from them.
Instagram has a different shape, you upload less but get a lot more visibility. It’s a good place to help your community keep up with the pulse of what’s going on via brief snapshots.
Could you share a link to your Flickr? How about a strategy where you upload whole albums to Flickr and then select a couple highlights from that to post to Instagram?
The thing here isn’t storage; it’s engagement.
We store photos on Google Photos. But we post to Instagram to engage our community.