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For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
Message Bender - Backup and delete all Slack messages in bulk
Google Drive - Access and sync your files anywhere
Slack Deletron - Delete files from your Slack Workspace!
Mega - Secure File Storage and collaboration
Public - Group chats.