Freelancers and agencies use Upfling to deliver client work: portfolios, design previews, proposals, presentations. The link works behind corporate firewalls, stays live permanently, and can be password-protected.
WeTransfer
Free links stop working after 7 days. You re-send the file, the client re-downloads it, everyone loses the thread.
Upfling URLs are permanent. The link works for as long as the site exists.
Google Drive
The viewer gets a "request access" prompt. Your client emails you, you check sharing settings, you try again. Clients behind corporate firewalls often cannot open Drive links at all.
Upfling serves a normal website. No permissions, no sign-up, no platform to whitelist.
Dropbox
Shared folders require a Dropbox account or hit a sign-up wall. Corporate networks block Dropbox the same way they block Drive.
Upfling is standard HTTPS on a global CDN. If your client can open a website, they can open your link.