What do you use to take your notes that is cross-platform and supports Markdown? I am having a hard time finding something that checks all the boxes.

• Cross-Platform (Android, iOS, Mac, Linux)
• Markdown support
• Web Clipper (not super important but nice to have)
• Media support
• Accessible via web if not accessible on Linux
• Exportable to Markdown (for sharing or backups)
• Syncing/Offline support
• No more than $36 a year

There are more things that I would like but I think this small list is what is most important to me.