I converted a project written in VS2017 to VS2019. I used the File System Upload SPIFFS and the output shows it was successful. 
However, when using LittleFS in code to open the files it fails because the files do not exist. 

I am able to read and write files in code, but the uploading seems to fail even though it shows it was successful. 

Visual Micro version: 2.2024.0926

Here's a basic example. File System Upload Tool is set SPIFFS which is what I've always used. The data upload says it was a success but when I use LittleFS in code the file read fails. 

But I can create, save and read files in code using LittleFS. I just can't access the file that was uploaded if it was even uploaded.

#include "LittleFS.h"

/*
Initialize LittleFS
*/
void initFS() {
     if (!LittleFS.begin()) {
           Serial.println("Error mounting LittleFS");
     }
     else {
           Serial.println("LittleFS mounted");
     }

}

void setup()
{
     // Serial port for debugging purposes
     Serial.begin(115200);

     initFS();

     File file = LittleFS.open("/AddFooter.png", "r");
     if (!file) {
           Serial.println("Error openning AddFooter.png for reading.");
     }
     else {
           Serial.println("Success openning AddFooter.png for reading.");
           file.close();
     }


}

void loop()
{


}

Thanks for the details and resolution.

To my understanding the LittleFS partitions and files are written differently as an FS so they aren't meant to be interoperable.

I do have a vague recollection of it seeming like that, however it seems if it did work it wasn't by design:
https://forum.arduino.cc/t/littlefs-data-preservation/1064392/3