InDesign won't save to pdf

the following might help others who wish to assist you:

1. state the exact version of indesign
2. state your operating system and the exact version of it
3. when did you last successfully export-to-pdf?  have there been any os-updates or program-updates since that  time?
4. the last time you successfully exported to pdf … was the *.indd file located on ms-onedrive or locally (on your physical computer)?
5. did you try saving the *.indd  file as an *.idml file … and then exporting to *.pdf file?
6. there's alternative offsite storage systems online … have you tried any others?

additionally … have  you  cleared  your  *.indd  program  preferences?  others  on  this  forum  may  suggest  performing  this  step.

let's  continue …

try creating new *.indd file, single page, and one small text element … use the following parameters:

• disable facing page … disable master-text-frame
• 8.5" x 11"
• margins and bleeds set at 0.0"

highlight your text with mouse-cursor:

• choose "arial-regular" for font (18pt) … make sure text-frame is slightly larger than your word "hello"
• choose 100% black color only
• choose "none" for character styles … and "basic paragraph" for paragraph styles

save this new *.indd file to local-drive (on your physical computer). export to pdf … successful? close document and quit program … initiate program and open same local document … export to pdf … successful?

now, open local *.indd file and save file to ms-onedrive (off-site storage). export to pdf … successful? close document and quit program … initiate program and open same ms-onedrive document … export to pdf … successful?

if successful, try adding more elements that will adequately fit on the single page … save *.indd file to ms-onedrive … export to pdf … successful? if successful, add second page and try same routine … successful?  now,  include  a text-thread  from  the  first  page  to  the  second  page.  yep … by  now,  you  know  the  routine.

if successful in above scenarios … it's time to open your official document. the file is located locally … open the *.indd file and delete all pages, except the first page … delete all text elements from that first page … save *.indd file locally using filename "test01.indd" … export to pdf … successful? close document and quit program … initiate program and open same local document … export to pdf … successful?

now, open local "test01.indd" file and save to ms-onedrive (off-site storage) … export to pdf … successful? close document and quit program … initiate program and open same off-site document … export to pdf … successful?

best  practices:

1.) personally … i'd  always  work  locally … copying  file  to  ms-onedrive only  when  imperative.  if  your  environment  mandates  you  store  files  offsite … copy  the  file  locally  and  export  to  ms-onedrive at  end  of  file-work  or  shift-end.

2.) personally … i'd  work  only  with  commercial  open-type  fonts.  google-fonts are fun … but pose inherent risks in using them (security risk … unstable … etc.).  yes … fonts  can  be  a  vector  for  exploits  'n  attacks.

3.) understand  your  images … only  large  enough  to  fit  at  100%  dimensionally … *.tif  or  *.png  format … cmyk  gamut  if  printing  to  press.

4.) lots  of  things  can  be  done,  and  are  done,  with  indesign … imo,  maybe  some  of  those  cool  features  are  not  robust  enough,  or  particularly  suitable,  for  ms-onedrive  activities?

well … that's  about  all  i  got … peace  out.