how can I parse all the content of the file at once?

[Alisheikhalii]

Hi, I have a dataset, a PDF file which is included Persian text questions on top of math equations it has 19 pages and 40 math questions. I tried to pare and convert the pdf file to jason file but liama cloud could not extract the questions and math equations turn into jason, it only converted three questions of the content of the file, please help me how I can convert all the content of the file at once by liama cloud,

here is my pdf file :
math2.pdf

and here is the jason file which liama index has converted:
output.txt

this is job logs and error when liama cloud wants to make jason file

Job logs
Page Errors and Warning details
Page 1 [error] - FONT_ERROR : Fail to identify 8 glyphs on page 1 from font : SymbolMT
Page 2 [error] - FONT_ERROR : Fail to identify 4 glyphs on page 2 from font : SymbolMT
Page 3 [error] - FONT_ERROR : Fail to identify 7 glyphs on page 3 from font : SymbolMT
Page 4 [error] - FONT_ERROR : Fail to identify 12 glyphs on page 4 from font : SymbolMT