MediaFire is an online storage and collaboration service. Users upload files to the cloud and reach them from a web browser or from apps for iPhone, Android, macOS and Windows, according to the company. The service is hosted by the provider, so there is no software to run on your own infrastructure.
MediaFire describes itself as a United States company and states that its data centre is located in the United States. Its privacy statement says personal information is transferred, stored and processed in the United States, and that the company aims to comply with the GDPR and to give transferred data a level of protection equivalent to the GDPR. For a European organisation, the relevant points are US jurisdiction over the provider and the absence of an EU hosting option on the pages reviewed.