Peter it worked! Thanks a lot for providing super speedy Saturday help! 
Nice weekend to you!

On Saturday, 14 October 2023 at 21:48:36 UTC+2 Peter Bienstman wrote:

> Can't you provide a filename for that new database in that dialog? Just 
> call it tmp.db, then open your own database again. Then, put tmp.db renamed 
> as default.db in the export.
>
> Peter 
>
> On Sat, 14 Oct 2023, 20:47 Niclas Rieger, <niclas...@gmail.com> wrote:
>
>> Sorry it's not clear to me how to create an empty database. I see File > 
>> New... but that option want to open a file...it does not create a new 
>> (empty) one. Sorry if the solution is obvious :/
>>
>> On Saturday, 14 October 2023 at 17:26:27 UTC+2 Peter Bienstman wrote:
>>
>>> Create an empty database using the desktop app, and use that instead.
>>>
>>> Also edit a file like machine id or something, and change the contents 
>>> to something else. 
>>>
>>>
>>> Peter 
>>>
>>>
>>> On Sat, 14 Oct 2023, 17:21 Niclas Rieger, <niclas...@gmail.com> wrote:
>>>
>>>> good idea! I just tried that with the database I have on my Desktop 
>>>> version and with export - import I could make the App "mimick" the same 
>>>> state as the Desktop version, i.e. both Desktop and App have the same 
>>>> number of scheduled, not memorized and active cards. Syncing still fails, 
>>>> however, with the same error as before. 
>>>>
>>>> How can I create an empty database?  At first I thought it would be in 
>>>> File > New... but here I'm asked to provide a new database which then 
>>>> seems 
>>>> to be loaded.
>>>>
>>>> On Saturday, 14 October 2023 at 17:03:40 UTC+2 Peter Bienstman wrote:
>>>>
>>>>> That's strange, because normally in the later Android versions all 
>>>>> data is removed upon uninstall. 
>>>>>
>>>>> Possible workaround: export data from the Android app, modify the zip 
>>>>> file to include an empty database, and reimport. 
>>>>>
>>>>> Peter 
>>>>>
>>>>> On Sat, 14 Oct 2023, 16:50 Niclas Rieger, <niclas...@gmail.com> wrote:
>>>>>
>>>>>> Is there a possibility to incorporate a feature into the app that 
>>>>>> enables users to remove any existing local database? like having a handy 
>>>>>> "reset" button for the app. Alternatively, would it be possible to 
>>>>>> ensure 
>>>>>> that the app performs a thorough cleanup when it's uninstalled? 
>>>>>>
>>>>>> In the meantime, I'll explore whether there's a way to access the 
>>>>>> internal data on my phone. It appears that this newer Android model I 
>>>>>> have 
>>>>>> only allows access to standard data files such as images, downloads, and 
>>>>>> documents.
>>>>>> On Saturday, 14 October 2023 at 16:31:06 UTC+2 Niclas Rieger wrote:
>>>>>>
>>>>>>> I Looked for "sdcard", but unfortunately nothing. I remember that I 
>>>>>>> could access Mnemosyne data in the past on my phone, but I a got a new 
>>>>>>> phone which may be the problem... 
>>>>>>>
>>>>>>> On Saturday, 14 October 2023 at 16:07:34 UTC+2 Peter Bienstman wrote:
>>>>>>>
>>>>>>>> Try looking for a directory /sdcard/Mnemosyne or something like 
>>>>>>>> that. 
>>>>>>>>
>>>>>>>> Cheers, 
>>>>>>>>
>>>>>>>> Peter 
>>>>>>>>
>>>>>>>> On Sat, 14 Oct 2023, 15:37 Niclas Rieger, <niclas...@gmail.com> 
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Hi Peter et al.
>>>>>>>>> Just got a fresh install of 2.10.1 - thank you! I wanted to sync 
>>>>>>>>> my Android App but got the error message:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> *Error: mismatched user ids. The first sync should happen on an 
>>>>>>>>> empty database. Backup then delete the local database and try again. *
>>>>>>>>>
>>>>>>>>> Removing and reinstalling from the PlayStore, however, does not to 
>>>>>>>>> remove the local database, it seems since I already have scheduled 
>>>>>>>>> cards 
>>>>>>>>> when I first open it & the error persists.
>>>>>>>>>
>>>>>>>>> Now, I want to delete the local database files on my phone 
>>>>>>>>> manually. But neither through my phone, nor by connecting through USB 
>>>>>>>>> cable/Ubuntu  I am able to track down the mnemosyne files. In Ubuntu, 
>>>>>>>>> changing to the root directory where my phone is mounted and then 
>>>>>>>>> entering 
>>>>>>>>> this directory, I see two directories (1) Phone and (2) Card. Running
>>>>>>>>>
>>>>>>>>> *find . -type d -name "*mnemosyne*" -print*
>>>>>>>>>
>>>>>>>>> in a terminal yields just two entries*,*
>>>>>>>>>
>>>>>>>>> ./Phone/Android/data/org.mnemosyne
>>>>>>>>> ./Card/Android/data/org.mnemosyne
>>>>>>>>>
>>>>>>>>> which are both empty. Any idea where I can find this infamous 
>>>>>>>>> database?
>>>>>>>>> Thank you
>>>>>>>>> Niclas
>>>>>>>>>
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