Read the input directly rather than from the URL for generating thumbnail

[mjh1]

No description provided.

[codecov]

Codecov Report

Merging #41 (68ccbed) into main (f21e006) will increase coverage by 0.09705%.
The diff coverage is 9.09091%.

@@                 Coverage Diff                 @@
##                main         #41         +/-   ##
===================================================
+ Coverage   15.52795%   15.62500%   +0.09705%     
===================================================
  Files              2           2                 
  Lines            161         160          -1     
===================================================
  Hits              25          25                 
+ Misses           127         126          -1     
  Partials           9           9                 

Files	Coverage Δ
core/uploader.go	20.16129% <9.09091%> (+0.16129%)	⬆️

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Files	Coverage Δ
core/uploader.go	20.16129% <9.09091%> (+0.16129%)	⬆️