I create a new custom symbol and import tick data to mt5.
Check the folder and see some *.tkc files.
So I close the MT5 client and restart the MT5, check the folder, all tkc files have been deleted. Why? I have to import tick data every time.
This is a bug. Now you can not trust the Terminal with the storage of ticks. They can disappear right during the operation of the Terminal (without restarting).
Developers have long known about this bug. Do not remove your CSV-files or other sources of ticks.
PS The tkc-file increases in size on the same data.
You can report to the service desk -
Because there are few threads on the forum where the users are asking/forcing the MQ "to fix a bug" ... and when MQ is starting to explain and more so everybody sees that it is not a bug ...