Hello @Tanshe,
Welcome to the forum!
The web interface was not intended for daily usage or upload big files. While you waiting for a release, you may use Cyberduck or FileZilla, rclone or uplink.
The choice is depend on your upstream bandwidth, if it’s greater or equal to 100Mbit, you may use a native integration (FileZilla Native Integration | Storj Docs, Uplink CLI | Storj Docs, Rclone with Native Integration | Storj Docs), if it’s lower than 20Mbit it’s better to use an S3-compatible clients (Cyberduck, FileZilla PRO, Rclone with Hosted Gateway | Storj Docs, etc.)
See also Hotrodding Decentralized Storage