There is a “ESP-IDF: SDK Configuration editor” setting to enable Long filename support.
Open menuconfig (see here for how to)
Component config > FAT Filesystem support > Long filename support
Choosing heap or stack to store long filenames?
Both are stored in RAM so arguably it doesn’t matter too much. A general guide though is the stack is generally used for storing small, short-lived variables such as local variables and function parameters, while the heap is generally used for storing larger, longer-lived objects.
So, unless you are keeping files open for long periods of time, the stack is probably better.
USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through mini sites like this. We hope you find the site helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support on this site. If you need help with a problem please use one of the many online forums.