Android - Database insert not inserting

I am including a database in my Android application. I am following the guide here:

http://ift.tt/1oalrZT

I have a "DatabaseHelper" class that extends SQLiteOpenHelper as suggested, and I have a Contract that holds the information about the table and implements 'BaseColumns'. Therein, I have a function for inserting a new row into the database:

public static void addUploadInfo(SQLiteOpenHelper dbHelper, UploadInfo info) {
    // Gets the data repository in write mode
    SQLiteDatabase db = dbHelper.getWritableDatabase();

    ContentValues values = info.getContentValues();

    // Insert the new row, returning the primary key value of the new row
    long newRowId;
    newRowId = db.insert(
            UploadInfoTable.TABLE_NAME,
            null,
            values);

    db.close(); // Closing database connection

    info.setDatabaseId(newRowId);
}

I am using the database to store app related meta data about a file. When I create a new file, I run the above function, and a row is successfully added to the database (and the database is created successfully if needed). I can see it using:

public static List<UploadInfo> getUploadInfoList(SQLiteOpenHelper dbHelper) {
    List<UploadInfo> infoList = new ArrayList<>();

    SQLiteDatabase db = dbHelper.getReadableDatabase();
    String allQuery = "SELECT  * FROM " + UploadInfoTable.TABLE_NAME;
    Cursor cursor = db.rawQuery(allQuery, null);

    if (cursor.moveToFirst()) {
        do {
            infoList.add(new UploadInfo(cursor));
        } while (cursor.moveToNext());
    }

    cursor.close();
    db.close();

    return infoList;
}

However, when the app first loads, I insert a few initial entries into the database using:

@Override
public void onResume() {
    super.onResume();
    DatabaseHelper dbHelper = new DatabaseHelper(getActivity());
    for (UploadInfo info: uploadList) {
        UploadInfoTable.addUploadInfo(dbHelper, info);
    }
}

These entries are assigned a new row ID that appears to be the correct value (not -1 indicating an error). There are no errors in the log. However, they are not found when I next run getUploadInfoList.

I have also tried this alternate insert function:

public static void addUploadInfo(SQLiteOpenHelper dbHelper, UploadInfo info) {
    SQLiteDatabase db = dbHelper.getWritableDatabase();

    ContentValues values = info.getContentValues();

    // Insert the new row, returning the primary key value of the new row
    db.beginTransaction();
    long newRowId = -1;
    try {
        newRowId = db.insertOrThrow(
                UploadInfoTable.TABLE_NAME,
                null,
                values);
        db.setTransactionSuccessful();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        db.endTransaction();
    }

    db.close(); // Closing database connection

    info.setDatabaseId(newRowId);
}

but I see the same result. In no case is info null. I always log the contents of the ContentValues. I use final variables for column names, so don't think I have an error in column name. This would show up as a row value of -1 anyway, and it doesn't.

Why would one implementation of the code insert successfully and the other not?