The Publish window checks each post against its network's rules before you schedule it.
Text limits
X: 280 characters per post
Threads and Pinterest: 500
Instagram and TikTok: 2,200
LinkedIn: 3,000
Telegram: 4,096
YouTube: 5,000
Facebook: 63,206
WhatsApp: 65,536
Media
Instagram and Pinterest need an image.
TikTok and YouTube need a video.
Files per post: X up to 4, LinkedIn up to 9, TikTok, YouTube and Pinterest 1, the others up to 10.
X threads
For an X thread piece, each paragraph becomes one post in the thread, and each must be 280 characters or fewer.
Scheduling
Pick a time in the future, up to a year ahead.