Saving a Picture as png to an server regardless of OS, png for better xamarin support, no system.drawing works on linux/windows,

PictureHelperFunctions.cs

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;
public static class GenericHelperFunctions
{
    public static bool RegChecks(string checkedto)
    {
        string pattern = @"^[a-zA-Z0-9_.-]*$"; // Letter and words only
        Regex regex = new Regex(pattern);
        DebugWrite(regex.IsMatch(checkedto));
        // Compare a string against the regular expression
        return regex.IsMatch(checkedto);
    }
    /// <summary>
    /// A Picture saver using SixLabors ImageSharp
    /// Works for png, jpeg, jpg, rest is untested
    /// </summary>
    /// <param name="file">FormFile comming from an ASP.Net API</param>
    public static string SavePicture(IFormFile file)
    {
        string filePath = "";
        string filename = "";
        filename = file.FileName.Replace(".jpg", ".png").Replace(".jpeg", ".png").ToLower();
        filePath = Path.Combine(FileLocations.ImageData, filename); //FileLocations in an static class with known folders
        SixLabors.ImageSharp.Formats.IImageFormat h = Image.DetectFormat(file.OpenReadStream());
        Image img = Image.Load(file.OpenReadStream());
        img.SaveAsPng(filePath); //saves any picture format to png
        return filename.ToLower();
    }
    /// <summary>
    /// Searches a picture from the wellknown picture location
    /// </summary>
    public static Tuple<int, byte[]> FindImage(string name)
    {
        if (name == null || name == "")
            return Tuple.Create<int, byte[]>(0, null); // Just being sure
        name = name.Trim(); //no white spaces in the name tag like "henk "
        name = name.ToLower(); // "not saving images with any UPPER characters so searching for uppercase characters is useless"
        string path = FileLocations.ImageData;
        if (name.IndexOf(".png") >= 0)
        {
            name = Path.Combine(path, name);
            if (File.Exists(name))
            {
                byte[] picture = File.ReadAllBytes(name);
                Tuple<int, byte[]> retPicture = Tuple.Create(1, picture);
                return retPicture;
            }
        }
        // If there is no extions on image it will look for one
        string png = name + ".png";
        png = Path.Combine(path, png);
        if (File.Exists(png))
        {
            byte[] picture = File.ReadAllBytes(png/*Path.Combine(png)*/);
            Tuple<int, byte[]> retPicture = Tuple.Create(1, picture);
            DebugWrite("Found PNG");
            return retPicture;
        }
        return Tuple.Create<int, byte[]>(0, null); //Escape Goat
    }
}