NativeScript file.renameSync() fails on Android 12 with "Error: Failed to rename file..." - filesystems

Question

I have file system code that renames a file in the documents folder within a NativeScript JavaScript application. It's worked for years on both iOS and Android, but now fails consistently on Android 12.
The code looks like this:
const fs = require("#nativescript/core/file-system");
let documentsPath = fs.knownFolders.documents().path;
let filePath = fs.path.join(documentsPath, filename);
let tempPath = fs.path.join(documentsPath, filename + ".tmp");
let newFile = await http.getFile(httpRequestOptions, tempPath); // file object
if (fs.File.exists(filePath)) { // if older data file exists
let oldFile = fs.File.fromPath(filePath);
oldFile.removeSync((error) => {
console.log("removeError: " + error );
});
}
newFile.renameSync(filename,(error) => {
console.log("renameError: " + error );
});
On Android 12, this code now fails with the message,
renameError: Error: Failed to rename file '/data/user/0/tech.govia.festivelo/files/FV_22_Thurs_Long.pdf.tmp' to 'FV_22_Thurs_Long.pdf'
But doesn't give any insight into why it failed. This occurs on a Samsung Galaxy S10e device.
I can create and delete files successfully, but can't rename. I'd welcome any insights here, as I haven't found anything in my searches.
Edit Sep 6, 2022: for what it's worth, I can read the new file's content and write it out to a new file to effectively perform a copy, so I have a hacky workaround, 'tho it's way less efficient that simply renaming.

Answer 1

Turns out a fully-qualified path is required on Android 12, not just a filename, so changing
newFile.renameSync(filename,(error) => {
console.log("renameError: " + error );
});
to
newFile.renameSync(filePath,(error) => {
console.log("renameError: " + error );
});
Is sufficient to fix the problem.
Much thanks to triniwiz on the {N} Discord for the pointer.
Edit Sep 8 2022: Testing on iOS reveals file name is still needed, and using a full path causes an error.