more people are working remotely which probably requires more people looking for ways to share files more efficiently.

Most of the people do need to find a ways to share files more efficiently, but hardly any sane company would choose Dropbox given their security proposal.

For any given technology or service, given the choice between the cheapest consumer option and a reliable enterprise option that costs 50% more, most small businesses will choose the consumer option every time.

Which would be OneDrive

For me and my company and friends this has meant more realizing the features of things we already paid for (Office 365, etc) rather than paying for Dropbox.

The last thing my free account does is sync my 1Password - and I’ll likely go cloud on that soon anyway

I imagine that sharing files would be the same regardless of whether you are remote or not. Even in a real office people don't usually hand USB sticks back and forth.

I have no data, but more remote people either has 0 impact, or impact on more data sharing online. Lots of businesses still work a lot on paper (think lawyers, notaries, etc) especially while working with clients, and are not forced to share docs differently.

All remote collaboration software is growing like bonkers during the pandemic because of remote work.

How workflow changes regarding storage when employees start working remotely?

People will just share the same way they shared while in the office.

Because they are core piece of remote work culture, like Zoom and Box.

They’re a core piece of regular office work as well. Apps like Zoom were not part of the office life, while Dropbox was.