Media

createPost uploads the files it is given. The upload methods are also exposed on their own:

const image = await linkedin.uploadImage("shot.png"); // urn:li:image:…
const video = await linkedin.uploadVideo("demo.mp4"); // urn:li:video:…, once processed
const document = await linkedin.uploadDocument("deck.pdf"); // urn:li:document:…, once processed

Kind	Formats	Size	Notes
Image	JPG, PNG, GIF (up to 250 frames)	under 36,152,320 pixels	1 per post, or 2 to 20 as a gallery
Video	MP4	75 KB to 500 MB, 3 s to 30 min	uploaded in 4 MB parts
Document	PDF, PPT, PPTX, DOC, DOCX	up to 100 MB and 300 pages	shown as a swipeable carousel

The extension and the size are checked before anything is sent (checkMedia, MEDIA_RULES).

Each upload asks LinkedIn for an upload URL (initializeUpload), then PUTs the bytes there. A video is uploaded in the parts LinkedIn lists, and finalized with each part's ETag. Videos and documents are then processed by LinkedIn. The SDK polls their status until they are AVAILABLE, every 2 seconds for up to 10 minutes (poll: { intervalMs, timeoutMs }). A token with only w_member_social may be refused that status read. The post is then retried while LinkedIn says the media is still processing. A failed processing throws LinkedInMediaError with LinkedIn's reason.