Is it safe to keep crypto on Uphold?

I'm considering storing my cryptocurrency on Uphold, but I'm wondering about the safety of doing so. Can you tell me more about the security measures Uphold has in place to protect user funds? Are there any known vulnerabilities or risks associated with keeping crypto on this platform? Additionally, how does Uphold compare to other cryptocurrency exchanges and wallets in terms of security? I'd like to make an informed decision before entrusting my digital assets to any platform.