Error Code 540

Hi Users Group:

I hope that you are well and staying safe.

I am a novice with LO. Using LO Version: 6.4.4.2 (x64) Build ID: 3d775be2011f3886db32dfd395a6a6d1ca2630ff.

I am trying to clean up an existing LO-Calc file by calling data from an external .ods file source. Am presently facing an error code # 540.  FWIW, the external source .ods file was initially generated using Apache Open Office, but I am now editing it via LO.

I found the definition of code 540: 'External content disabled', but have notfoundhow to 'enable external content'.  Tried searching within the F1 Help index for enable external content, w/o success.

I would appreciate help in finding out how I should go about enabling the external source file, which is on my Windows10-x64 C: drive. Must enabling be done within the source file? Is there a menu selection for this?

Thanks for reading this.

Regards,

VinceB.