If it is to store images, this one:
- ImgBB (There is extension)
- Imgur (API, Extension)
- ImgBox (No extension, No API)
If you want to store data (text), this one:
- Cloud DB (Cloud or own Server)
- SpreadSheet (Extension, Component)
- Airtable (Extension, Component)
- File (Offline Storage)
- TinyWeb (Platform)
- TinyWeb (Own DB, there is a guide by Tanish Raj)
If it is to store videos, this one:
- Streamtape (Extension)
- DoodStream (Extension)
- DailyMotion (API + Extension)
If it is to store video + data + files, this one:
- Google Drive (Extension)
- Mega NZ (Extension)
- Mediafire (API - Premium)
- Fireload (API - Premium)
- Cloudinary (Extension, Component)
Remember, some may have premium or paid versions that offer better services such as more storage, bandwidth, upload limits, download limits.
Most of them have a free version that can be used many times in medium to high level projects.
Greetings!