Hi @Toni,
My understanding here is that file input utilises the browser, therefore your constrained to file sizes through the browser limits whatever they may be, you can increase the max message length but I don’t think this goes very far that I was able to tell before I gave up on this route. I was able to go from ~10 to 30mb I didn’t find the upper limit exactly but it was less than 80mb for myself. The below was done from command line rather than jupyter
panel serve --show SinglePTPlotter.ipynb --websocket-max-message-size 1000000000
For myself I use the multi - FileSelector or param, from this your able to obtain the path & filename selected in code and then process into panadas dataframe for example. I’m not sure how the multifile selector differs under the hood, my guess is it runs server side somewhat and therefore not restricted to browser file size limits and has access to path names that is otherwise restricted I think if the input mechanisim is using web browser features. I would like to see something like this but for single files, the param has single file but it’s more like a drop down list box and not a browser as such - if a drop down box would work for you then it’s an option. See my param multi file selector query it has a list box, you can see from the code - nb I don’t know if this is the right way but it’s a way and I’m interested in other ways too.
So I guess in short I make use of single file selctor param, multi file selector widget / param working with files 300MB and up.
Hope the above is of some help (& apologies for regurgitating everything and more you probably read in your link)
Thanks, Carl.