By "sudden" the "Upload method" selector is no longer seen in the Tools menue in IDE 2.0.1.
Windows 11.
Too bad.
Any suggestion?
Hi @resources. Which board do you have selected from the Tools > Board menu in the Arduino IDE?
Doesn't matter. Uno, ESPs etc.

Tools > Upload Method is a "custom board option" menu. In addition to the menus that are defined in the Arduino IDE codebase (e.g., Tools > Port), boards platform authors can configure additional menus to be added under the Tools menu when a board of their platform is selected.
The Uno does not have an "Upload Method" custom board option, so it is normal and expected that there will not be an Tools > Upload Method menu when that board is selected. Other 3rd party boards platforms do have this custom board option. If you select one of those boards from that menu then you will find the menu appears.
What made you expect to find this menu? For example, are you following a tutorial? Did you see this menu in the IDE at some previous time?
What is the specific reason you wanted to find the menu? Is there something you are trying to accomplish that would require you to select something from the menu? If so, what exactly are you hoping to accomplish?
Thanks, so I got little confused since I worked for some time on the STM32f103 where I have to chose the upload method, depending on the core.
Then having an ESP board, there was no upload method selector for any of those variants., as intended since there is just the USB connector.
Sorry for the trouble.
You are welcome. I'm glad if I was able to be of assistance.
It is quite confusing because it is unexpected that the contents of the menu would change depending on which board was selected, but at the same time it is a really powerful feature of the Arduino boards platform system. The official Arduino boards platforms don't use it heavily, but some of the 3rd party platforms have done some amazing things with the feature. Even though the Espressif board platforms don't have the "Upload Method" menu specifically, they added a bunch of other menus which provide an amazing amount of configurability. Between the boards and all their options, I calculated the number of possible board configurations is in the millions!
I am "Arduining" for years, but this hit me yesterday (night)....
Why not asking to make it consistent between boards, I mean not to take out the Upload Selector, just labelling it "Serial" in those cases?
OK, there are probably more things to be done.
The Upload Selector item is not being taken out of the menu, rather it is being added only when needed, as is the case of the Expressif board items mentioned by @ptillisch
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