Using "Picture Card" to get PNG file from Website but not updating

Configuration
1

Haven’t found a solution yet
Using Picture Card to get many PNG graph files from my website that are generated by a RPI3 connected to many temperature sensors. Works great except they do not update properly. Some time several hours behind on files that are update every 10 mins.
In a browser on Win10 I can press CTRL F5 to force an update but have no option here.
Does anyone have a solution for this problem? I have seen the question several places but no solutions. Thanks
Simple code used:

      - type: picture
        image: http://xxx.com/Temperatures/Temperature6.png
        tap_action:
          action: url
          url_path: http://xxx.com/Temperatures/Temperature6.png
2

Is it possible to cut out the middleman (the webpage) and send the data direct to Home Assistant?

3

I could but would have to open up ports to see data files from out of LAN.
Using Website to avoid these security issues. Could send to both location but will need to add another RPI or other device as the current RPI doing all the measurements, chart generation, and sending charts to website is a bit over taxed. Maybe an RPI4 would do it…
Still was hoping for an easier solution. Judging by how so many people seem to have the same issue, I guess if there was an easy fix it would be out there. Thanks

4

Have you tried adjusting the url to …png?v=1
I have to do this everythime I modify my images, it will use the old version unless I add a different version number to it.

5

Well that was a surprise.
I think that works. Will need to check over a few days but looks great so far.
Thank you so much for this info…