Unsolved ios app ,after update, load file failed

[MLGDN]

I save a file In the application sandbox ，under Documents directory。when my application start， it read the file successfully。but after update from app store， it read failed。it becomes to create a new file。I confused， why the file was not backed up，what i did wrong?

[SGaist]

Hi,

How are you getting the path for your file to be saved ?

[MLGDN]

@SGaist

I tried 2 ways.

at first，I user this way。
m_Path = QStandardPaths::standardLocations(QStandardPaths::DataLocation).value(0);
m_Path = m_Path + "/myAppName";

when I find this problem，I change to another
m_Path = QDir::homePath() + "/Documents" + "/myAppName";

[SGaist]

When you say you update from the app store, do you mean through TestFlight or is your application already released ?

[MLGDN]

@SGaist

my application is already released

[MLGDN]

@SGaist

thanks for you reply!
can you help me to see another problem what confused me a long time
https://forum.qt.io/topic/61397/qt5-qopengglwidget-ios

[SGaist]

AFAIK, the files under Documents should be migrated to the new app version.

Out of curiosity, why are you using your application name for that file ?

[MLGDN]

@SGaist

using my application name for that file just for example，I can change to another name，may be I need to commit at least twice in the next time to verify this way。