Upload images, videos or documents to AdaptlyPost storage and return public URLs for the mediaUrls of create_post, update_post, or bulk_schedule_posts. Three sources, combinable in one call: attachments (files the user attached in a ChatGPT conversation, which ChatGPT passes as file references; use this for every file attached in ChatGPT, whatever its size), urls (public https URLs the server streams straight into storage; private, internal and non-https addresses are refused) and files (base64 data, for small media attached in other apps; 30 MB decoded per call in total). Omitting all three returns an error. Accepts JPEG, PNG, WebP, GIF, MP4 and QuickTime, plus PDF, PPT, PPTX, DOC and DOCX for LinkedIn DOCUMENT posts, checked by file content (and, for Office files, the extension, so keep it in the name or URL); 50 MB per image, 100 MB per document, 250 MB per attachment or URL download. Stored files are public immediately, post or no post, so only upload media the user supplied or asked for. For base64 files over 30 MB use get_upload_urls and PUT the bytes yourself. Returns uploaded ({ publicUrl, key } per file) and mediaUrls; pass mediaUrls straight into the post. One publicUrl may be reused across any number of posts; the file is kept until the last post referencing it has published, so upload once and reuse rather than re-uploading per post.
