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Everything you have attached to a message, and every file you have saved from a reply, newest first. Games and apps open in the full-screen player on their own sandboxed web address.
Saving creates the folder in Tandem. The always-on Tandem service starts it automatically.
One AI drafts, the other reviews and adds to it, then the first writes the final answer. You see one answer; the steps hide behind a link. Pick the models in the picker at the top of the chat.
With Ask me each time, an AI may ask to open a page or search the web; nothing is fetched until you tap Allow. Links you paste into your own message count as your approval and are read straight away. With Off, the AIs are not told they can browse and no links are fetched.
Tap 📎 in the message box, drag a file onto the chat, or paste a picture. Up to ten files per message, 2 GB each. Drop a whole folder (or tap 📎 → 📁) and it is zipped for you. Pictures are sent as pictures; text, code, PDF and Word files are read and quoted to the AI as data, never as instructions.
Code blocks in a reply get a ⬇ Download button; a reply with two or more files gets Download all (.zip), and every reply can be saved as a .md file. A reply holding a complete HTML page gets a ▶ PLAY button, which runs it on a separate, locked-down web address so it can never touch your login.
Tap the mic, talk, then press Stop & write it down. The words land in the box so you can edit them first. Transcription costs about $0.003 a minute and is counted in today's total. In Team up, only the final answer is read aloud.
Model lists come from each provider's own API about once an hour, mixed with
the friendly names, hints and prices in providers.json. Choose a model per AI
with the buttons just above the message box (or the picker at the top of the chat).
API keys stay on the server. They are never shown here or sent to this browser.