This Ableton Live walkthrough covers the full export process, from arrangement to finished file. Setting the Loop Brace to cover the exact duration you want, with extra room for reverb or delay tails, is the first step before opening Export Audio/Video from the File menu or with Shift+Cmd+R (Mac) or Shift+Ctrl+R (Windows).
The Selection settings determine what gets rendered: Master for a single stereo file, All Individual Tracks for a full stem set, or Selected Tracks Only for a partial export. Since the range was already set with the Loop Brace, the Start and Length fields can stay untouched.
In the Rendering section, Include Return and Master Effects bakes reverb and bus processing into each stem, which matters when preparing files for a mix engineer or remixer. Render as Loop adds fades for seamless looping, Convert to Mono drops the file to one channel, Normalize maximizes volume, and Create Analysis File saves an ASD for smoother reimporting into Live.
The final settings choose your file format: AIFF, FLAC, or WAV, plus bit depth (16, 24, or 32-bit) and sample rate. Adding an MP3 at 320kbps alongside the main file, uploading straight to SoundCloud, and exporting video when your set includes it round out the options before naming the file and choosing where it lands.