sendreceiveThe folder is in default mode. Sending local and accepting remote changes. Note that this type was previously called “readwrite” which is deprecated but still accepted in incoming configs.
sendonlyThe folder is in “send only” mode – it will not be modified by Syncthing on this device. Note that this type was previously called “readonly” which is deprecated but still accepted in incoming configs.
receiveonlyThe folder is in “receive only” mode – it will not propagate changes to other devices.
receiveencryptedMust be used on untrusted devices, where the data cannot be decrypted because no folder password was entered. See Untrusted (Encrypted) Devices.