Problem with big gif insert

[2-man]

Describe the bug
I am uploading gif, size 2.2 mb to wiki.js, trying to add this gif to post, result:
https://prnt.sc/s9gnx5
I was trying to check direct link to image but after couple seconds it drops cloudflare connection error 502

To Reproduce
Steps to reproduce the behavior:

1. Start editing post (wyswig editor)
2. Click on image add https://prnt.sc/s9gqbe
3. Upload gif to root folder https://prnt.sc/s9gqrv
4. Select uploaded gif to post https://prnt.sc/s9gr84
5. Start crying: https://prnt.sc/s9grh4

Expected behavior
It should add my gif to post 😂

Host Info (please complete the following information):

• OS: CentOS Linux 7 (Core)"
• Wiki.js version: 2.3.77
• Database engine: mysql 5.7.26
• Cloudflare
• Proxy in virtualmin panel