Adding new font to my custom fonts with AWS lambda not working

I'm using AWS lambda with python and ffmpeg to add textual watermark over images. I added a custom font i.e Quicksand to my lambda function like this:

1- Create a fonts directory in the root of the function and add the font file (.ttf) and a font.conf file with the following contents:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <dir>/var/task/fonts/</dir>
  <cachedir>/tmp/fonts-cache/</cachedir>
  <config></config>
</fontconfig>

2- Added an environment variable like this

FONTCONFIG_PATH = "/var/task/fonts"

It was working fine until I chose to add more fonts. Now when I try to use some font other than the Quicksand e.g Arial, it still uses the Quicksand font. I'm not sure why? In the CloudWatch Logs I can see it is still trying to access the Quicksand font rather than the Arial one even when the code is right. Any caching issue or something else?

My Folder Structure:

My docker file:

COPY requirements.txt ./
RUN yum update -y && \
    pip install -r requirements.txt

COPY . .
CMD ["app.handler"]

Cloudwatch logs:

[Parsed_drawtext_0 @ 0x70b5bc0] Using "/var/task/fonts/Quicksand.ttf"

Maybe its a caching issue? I'm not sure.