The phrase "an upside to" is correct and usable in written English, usually in the context of there being both positive and negative aspects to a situation.
For example: "There is an upside to the pandemic lockdown: people are spending more time with their families."
Exact(60)
There is an upside to this.
He sees only an upside to earthquakes.
But there's an upside to the samples.
"There's an upside to this," he said.
Mr. Luidhardt, the consultant, sees an upside to the challengers.
There is an upside to this sad downward trend.
I suppose there's an upside to this trend.
There is an upside to Nascar's making headlines so often.
Still, there's an upside to the Common Core's arrival.
There's always an upside to a near empty venue.
Could there be an upside to high blood pressure?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com