copying a ODS file and setting some cells to value in old file

(Please forgive me if this is a duplicate ... thank you)

I do this every year, but this year I am experiencing problems

OS Mageia 7, Plasma
LibreOffice 6.2.8.2

The original file is an 18 sheet ODS file used for budget purposes

I can successfully copy the original file (in original location) to the new file (in new location), either by ...
    open the old file and save-as (File -> Save As)
        or
    open Dolphin file manager, copy the old file, paste the file into a new location, and rename it to the new file
        or
    open a terminal and perform the copy operation there (cp oldlocation/oldfilename newlocation/newfilename

Then in the new file, I delete unwanted sheets and data to start the year fresh.  Next I set the values of some cells in the new file, to the values of some cells in the old file. (Example: ='file:///home/fredjame/mystuff/budget/2019/budget_2019.ods'#$'TD December 2019'.F114)

This has always worked well in the past, but this year, I am getting an error in the destination cell ... at first that was ErrL514, and now it is Err:540.

Can you advise, please?
Thank you
Regards
Fred James

(Please forgive me if this is a duplicate ... thank you)

I do this every year, but this year I am experiencing problems

OS Mageia 7, Plasma
LibreOffice 6.2.8.2

The original file is an 18 sheet ODS file used for budget purposes

I can successfully copy the original file (in original location) to the
new file (in new location), either by ...
     open the old file and save-as (File -> Save As)
         or
     open Dolphin file manager, copy the old file, paste the file into a
new location, and rename it to the new file
         or
     open a terminal and perform the copy operation there (cp
oldlocation/oldfilename newlocation/newfilename

Then in the new file, I delete unwanted sheets and data to start the
year fresh. Next I set the values of some cells in the new file, to the
values of some cells in the old file. (Example:
='file:///home/fredjame/mystuff/budget/2019/budget_2019.ods'#$'TD
December 2019'.F114)

This has always worked well in the past, but this year, I am getting an
error in the destination cell ... at first that was ErrL514, and now it
is Err:540.

Can you advise, please?

https://help.libreoffice.org/6.3/ar/text/scalc/05/02140000.html?DbPAR=CALC

Johnny Rosenberg wrote:

(Please forgive me if this is a duplicate ... thank you)

I do this every year, but this year I am experiencing problems

OS Mageia 7, Plasma
LibreOffice 6.2.8.2

The original file is an 18 sheet ODS file used for budget purposes

I can successfully copy the original file (in original location) to the
new file (in new location), either by ...
      open the old file and save-as (File -> Save As)
          or
      open Dolphin file manager, copy the old file, paste the file into a
new location, and rename it to the new file
          or
      open a terminal and perform the copy operation there (cp
oldlocation/oldfilename newlocation/newfilename

Then in the new file, I delete unwanted sheets and data to start the
year fresh. Next I set the values of some cells in the new file, to the
values of some cells in the old file. (Example:
='file:///home/fredjame/mystuff/budget/2019/budget_2019.ods'#$'TD
December 2019'.F114)

This has always worked well in the past, but this year, I am getting an
error in the destination cell ... at first that was ErrL514, and now it
is Err:540.

Can you advise, please?

https://help.libreoffice.org/6.3/ar/text/scalc/05/02140000.html?DbPAR=CALC

Thank you for the URL.  I found the definition of Err:540 ... "External content disabled".  From there I looked at LibreOffice help and found the instructions for inserting the reference/link to the cell in the other ODS file "To Reference a Cell in Another Document", which I followed right up to "Confirm the formula by clicking the green check mark.", but I don't have a green check mark to click.

Then I tried looking for where the external content might be disabled/enabled ... no luck so far.

Answers to the question(s) at Google seem to be written for other versions of Libreoffice, because they don't match too well to anything in this version (6.2.8.2)

Can you advise, please?
Thanks again
Regards
Fred James